diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 9a667c311..a28f50c6c 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -54,7 +54,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkInstanceTicker v-if="showTicker" :instance="appearNote.user.instance"/>
 			<div style="container-type: inline-size;">
 				<p v-if="appearNote.cw != null" :class="$style.cw">
-					<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'"/>
+					<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :lang="appearNote.lang" :author="appearNote.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
 				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
@@ -65,6 +65,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							v-if="appearNote.text"
 							:parsedNodes="parsed"
 							:text="appearNote.text"
+							:lang="appearNote.lang"
 							:author="appearNote.user"
 							:nyaize="'respect'"
 							:emojiUrls="appearNote.emojis"
@@ -76,7 +77,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<MkLoading v-if="translating" mini/>
 							<div v-else-if="translation">
 								<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
-								<Mfm :text="translation.text" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
+								<Mfm :text="translation.text" :lang="nativeLang" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 							</div>
 						</div>
 						<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
@@ -217,6 +218,7 @@ import { showMovedDialog } from '@/scripts/show-moved-dialog.js';
 import { shouldCollapsed } from '@/scripts/collapsed.js';
 import { useRouter } from '@/router/supplier.js';
 import { boostMenuItems, type Visibility } from '@/scripts/boost-quote.js';
+import { miLocalStorage } from '@/local-storage.js';
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -305,11 +307,12 @@ const renoteCollapsed = ref(
 	defaultStore.state.collapseRenotes && isRenote && (
 		($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) || // `||` must be `||`! See https://github.com/misskey-dev/misskey/issues/13131
 		(appearNote.value.myReaction != null)
-	)
+	),
 );
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const animated = computed(() => parsed.value ? checkAnimationFromMfm(parsed.value) : null);
 const allowAnim = ref(defaultStore.state.advancedMfm && defaultStore.state.animatedMfm ? true : false);
+const nativeLang = ref(miLocalStorage.getItem('lang') ?? window.navigator.language);
 
 /* Overload FunctionにLintが対応していないのでコメントアウト
 function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly: true): boolean;
@@ -416,7 +419,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index 52eaa84fc..d6ed69118 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -68,7 +68,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</header>
 		<div :class="$style.noteContent">
 			<p v-if="appearNote.cw != null" :class="$style.cw">
-				<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'"/>
+				<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :lang="appearNote.lang" :author="appearNote.user" :nyaize="'respect'"/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
 			<div v-show="appearNote.cw == null || showContent">
@@ -78,6 +78,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					v-if="appearNote.text"
 					:parsedNodes="parsed"
 					:text="appearNote.text"
+					:lang="appearNote.lang"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:emojiUrls="appearNote.emojis"
@@ -90,7 +91,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkLoading v-if="translating" mini/>
 					<div v-else-if="translation">
 						<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
-						<Mfm :text="translation.text" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
+						<Mfm :text="translation.text" :lang="nativeLang" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 					</div>
 				</div>
 				<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
@@ -258,6 +259,7 @@ import MkPagination, { type Paging } from '@/components/MkPagination.vue';
 import MkReactionIcon from '@/components/MkReactionIcon.vue';
 import MkButton from '@/components/MkButton.vue';
 import { boostMenuItems, type Visibility } from '@/scripts/boost-quote.js';
+import { miLocalStorage } from '@/local-storage.js';
 
 const props = defineProps<{
 	note: Misskey.entities.Note;
@@ -321,6 +323,7 @@ const replies = ref<Misskey.entities.Note[]>([]);
 const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
+const nativeLang = ref(miLocalStorage.getItem('lang') ?? window.navigator.language);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
 	if (expandAllCws !== showContent.value) showContent.value = expandAllCws;
@@ -438,7 +441,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/MkNoteSub.vue b/packages/frontend/src/components/MkNoteSub.vue
index 37811dd52..6c00fab92 100644
--- a/packages/frontend/src/components/MkNoteSub.vue
+++ b/packages/frontend/src/components/MkNoteSub.vue
@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkNoteHeader :class="$style.header" :note="note" :mini="true"/>
 			<div :class="$style.content">
 				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'"/>
+					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :lang="note.lang" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
 				<div v-show="note.cw == null || showContent">
@@ -281,7 +281,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 9d726c388..e573f3f9c 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -69,16 +69,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 	</div>
 	<MkInfo v-if="hasNotSpecifiedMentions" warn :class="$style.hasNotSpecifiedMentions">{{ i18n.ts.notSpecifiedMentionWarning }} - <button class="_textButton" @click="addMissingMention()">{{ i18n.ts.add }}</button></MkInfo>
-	<input v-show="useCw" ref="cwInputEl" v-model="cw" :class="$style.cw" :placeholder="i18n.ts.annotation" @keydown="onKeydown">
+	<input v-show="useCw" ref="cwInputEl" v-model="cw" :class="$style.cw" :placeholder="i18n.ts.annotation" :lang="language ?? undefined" @keydown="onKeydown">
 	<div :class="[$style.textOuter, { [$style.withCw]: useCw }]">
 		<div v-if="channel" :class="$style.colorBar" :style="{ background: channel.color }"></div>
-		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :readonly="textAreaReadOnly" :placeholder="placeholder" data-cy-post-form-text @keydown="onKeydown" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"/>
+		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :readonly="textAreaReadOnly" :placeholder="placeholder" :lang="language ?? undefined" data-cy-post-form-text @keydown="onKeydown" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"/>
 		<div v-if="maxTextLength - textLength < 100" :class="['_acrylic', $style.textCount, { [$style.textOver]: textLength > maxTextLength }]">{{ maxTextLength - textLength }}</div>
 	</div>
 	<input v-show="withHashtags" ref="hashtagsInputEl" v-model="hashtags" :class="$style.hashtags" :placeholder="i18n.ts.hashtags" list="hashtags">
 	<XPostFormAttaches v-model="files" @detach="detachFile" @changeSensitive="updateFileSensitive" @changeName="updateFileName" @replaceFile="replaceFile"/>
-	<MkPollEditor v-if="poll" v-model="poll" @destroyed="poll = null"/>
-	<MkNotePreview v-if="showPreview" :class="$style.preview" :text="text" :files="files" :poll="poll ?? undefined" :useCw="useCw" :cw="cw" :user="postAccount ?? $i"/>
+	<MkPollEditor v-if="poll" v-model="poll" :lang="language ?? undefined" @destroyed="poll = null"/>
+	<MkNotePreview v-if="showPreview" :class="$style.preview" :text="text" :lang="language ?? undefined" :files="files" :poll="poll ?? undefined" :useCw="useCw" :cw="cw" :user="postAccount ?? $i"/>
 	<div v-if="showingOptions" style="padding: 8px 16px;">
 	</div>
 	<footer :class="$style.footer">
diff --git a/packages/frontend/src/components/MkSubNoteContent.vue b/packages/frontend/src/components/MkSubNoteContent.vue
index 7e63bbe82..066eca9b4 100644
--- a/packages/frontend/src/components/MkSubNoteContent.vue
+++ b/packages/frontend/src/components/MkSubNoteContent.vue
@@ -9,14 +9,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<span v-if="note.isHidden" style="opacity: 0.5">({{ i18n.ts.private }})</span>
 		<span v-if="note.deletedAt" style="opacity: 0.5">({{ i18n.ts.deletedNote }})</span>
 		<MkA v-if="note.replyId" :class="$style.reply" :to="`/notes/${note.replyId}`" @click.stop><i class="ph-arrow-bend-left-up ph-bold ph-lg"></i></MkA>
-		<Mfm v-if="note.text" :text="note.text" :author="note.user" :nyaize="'respect'" :isAnim="allowAnim" :emojiUrls="note.emojis"/>
+		<Mfm v-if="note.text" :text="note.text" :lang="note.lang" :author="note.user" :nyaize="'respect'" :isAnim="allowAnim" :emojiUrls="note.emojis"/>
 		<MkButton v-if="!allowAnim && animated && !hideFiles" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
 		<MkButton v-else-if="!defaultStore.state.animatedMfm && allowAnim && animated && !hideFiles" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-stop ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.stop }}</MkButton>
 		<div v-if="note.text && translating || note.text && translation" :class="$style.translation">
 			<MkLoading v-if="translating" mini/>
 			<div v-else>
 				<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
-				<Mfm :text="translation.text" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
+				<Mfm :text="translation.text" :lang="nativeLang" :author="note.user" :nyaize="'respect'" :emojiUrls="note.emojis"/>
 			</div>
 		</div>
 		<MkA v-if="note.renoteId" :class="$style.rp" :to="`/notes/${note.renoteId}`" @click.stop>RN: ...</MkA>
@@ -51,6 +51,7 @@ import { defaultStore } from '@/store.js';
 import { useRouter } from '@/router/supplier.js';
 import * as os from '@/os.js';
 import { checkAnimationFromMfm } from '@/scripts/check-animated-mfm.js';
+import { miLocalStorage } from '@/local-storage.js';
 
 const props = defineProps<{
 	note: Misskey.entities.Note;
@@ -72,6 +73,7 @@ function noteclick(id: string) {
 const parsed = computed(() => props.note.text ? mfm.parse(props.note.text) : null);
 const animated = computed(() => parsed.value ? checkAnimationFromMfm(parsed.value) : null);
 let allowAnim = ref(defaultStore.state.advancedMfm && defaultStore.state.animatedMfm ? true : false);
+const nativeLang = ref(miLocalStorage.getItem('lang') ?? window.navigator.language);
 
 const isLong = defaultStore.state.expandLongNote && !props.hideFiles ? false : shouldCollapsed(props.note, []);
 
diff --git a/packages/frontend/src/components/SkNote.vue b/packages/frontend/src/components/SkNote.vue
index 09decad1a..2da2d857f 100644
--- a/packages/frontend/src/components/SkNote.vue
+++ b/packages/frontend/src/components/SkNote.vue
@@ -57,7 +57,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="[{ [$style.clickToOpen]: defaultStore.state.clickToOpen }]" @click.stop="defaultStore.state.clickToOpen ? noteclick(appearNote.id) : undefined">
 			<div style="container-type: inline-size;">
 				<p v-if="appearNote.cw != null" :class="$style.cw">
-					<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'"/>
+					<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :lang="appearNote.lang" :author="appearNote.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="appearNote.text" :renote="appearNote.renote" :files="appearNote.files" :poll="appearNote.poll" style="margin: 4px 0;" @click.stop/>
 				</p>
 				<div v-show="appearNote.cw == null || showContent" :class="[{ [$style.contentCollapsed]: collapsed }]">
@@ -67,6 +67,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							v-if="appearNote.text"
 							:parsedNodes="parsed"
 							:text="appearNote.text"
+							:lang="appearNote.lang"
 							:author="appearNote.user"
 							:nyaize="'respect'"
 							:emojiUrls="appearNote.emojis"
@@ -78,7 +79,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<MkLoading v-if="translating" mini/>
 							<div v-else-if="translation">
 								<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
-								<Mfm :text="translation.text" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
+								<Mfm :text="translation.text" :lang="nativeLang" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 							</div>
 						</div>
 						<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
@@ -218,6 +219,7 @@ import { showMovedDialog } from '@/scripts/show-moved-dialog.js';
 import { shouldCollapsed } from '@/scripts/collapsed.js';
 import { useRouter } from '@/router/supplier.js';
 import { boostMenuItems, type Visibility } from '@/scripts/boost-quote.js';
+import { miLocalStorage } from '@/local-storage.js';
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -306,11 +308,12 @@ const renoteCollapsed = ref(
 	defaultStore.state.collapseRenotes && isRenote && (
 		($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) || // `||` must be `||`! See https://github.com/misskey-dev/misskey/issues/13131
 		(appearNote.value.myReaction != null)
-	)
+	),
 );
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
 const animated = computed(() => parsed.value ? checkAnimationFromMfm(parsed.value) : null);
 const allowAnim = ref(defaultStore.state.advancedMfm && defaultStore.state.animatedMfm ? true : false);
+const nativeLang = ref(miLocalStorage.getItem('lang') ?? window.navigator.language);
 
 /* Overload FunctionにLintが対応していないのでコメントアウト
 function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly: true): boolean;
@@ -417,7 +420,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/SkNoteDetailed.vue b/packages/frontend/src/components/SkNoteDetailed.vue
index 80d6ac369..7d4f1a74b 100644
--- a/packages/frontend/src/components/SkNoteDetailed.vue
+++ b/packages/frontend/src/components/SkNoteDetailed.vue
@@ -77,7 +77,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</header>
 		<div :class="$style.noteContent">
 			<p v-if="appearNote.cw != null" :class="$style.cw">
-				<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :author="appearNote.user" :nyaize="'respect'"/>
+				<Mfm v-if="appearNote.cw != ''" style="margin-right: 8px;" :text="appearNote.cw" :lang="appearNote.lang" :author="appearNote.user" :nyaize="'respect'"/>
 				<MkCwButton v-model="showContent" :text="appearNote.text" :files="appearNote.files" :poll="appearNote.poll"/>
 			</p>
 			<div v-show="appearNote.cw == null || showContent">
@@ -86,6 +86,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					v-if="appearNote.text"
 					:parsedNodes="parsed"
 					:text="appearNote.text"
+					:lang="appearNote.lang"
 					:author="appearNote.user"
 					:nyaize="'respect'"
 					:emojiUrls="appearNote.emojis"
@@ -98,7 +99,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkLoading v-if="translating" mini/>
 					<div v-else-if="translation">
 						<b>{{ i18n.tsx.translatedFrom({ x: translation.sourceLang }) }}: </b>
-						<Mfm :text="translation.text" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
+						<Mfm :text="translation.text" :lang="nativeLang" :author="appearNote.user" :nyaize="'respect'" :emojiUrls="appearNote.emojis"/>
 					</div>
 				</div>
 				<MkButton v-if="!allowAnim && animated" :class="$style.playMFMButton" :small="true" @click="animatedMFM()" @click.stop><i class="ph-play ph-bold ph-lg "></i> {{ i18n.ts._animatedMFM.play }}</MkButton>
@@ -266,6 +267,7 @@ import MkPagination, { type Paging } from '@/components/MkPagination.vue';
 import MkReactionIcon from '@/components/MkReactionIcon.vue';
 import MkButton from '@/components/MkButton.vue';
 import { boostMenuItems, type Visibility } from '@/scripts/boost-quote.js';
+import { miLocalStorage } from '@/local-storage.js';
 
 const props = defineProps<{
 	note: Misskey.entities.Note;
@@ -330,6 +332,7 @@ const replies = ref<Misskey.entities.Note[]>([]);
 const quotes = ref<Misskey.entities.Note[]>([]);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
 const defaultLike = computed(() => defaultStore.state.like ? defaultStore.state.like : null);
+const nativeLang = ref(miLocalStorage.getItem('lang') ?? window.navigator.language);
 
 watch(() => props.expandAllCws, (expandAllCws) => {
 	if (expandAllCws !== showContent.value) showContent.value = expandAllCws;
@@ -447,7 +450,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/SkNoteSub.vue b/packages/frontend/src/components/SkNoteSub.vue
index 1cffd8dd6..6c30c55b3 100644
--- a/packages/frontend/src/components/SkNoteSub.vue
+++ b/packages/frontend/src/components/SkNoteSub.vue
@@ -20,7 +20,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<SkNoteHeader :class="$style.header" :note="note" :classic="true" :mini="true"/>
 			<div :class="$style.content">
 				<p v-if="note.cw != null" :class="$style.cw">
-					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :author="note.user" :nyaize="'respect'"/>
+					<Mfm v-if="note.cw != ''" style="margin-right: 8px;" :text="note.cw" :lang="note.lang" :author="note.user" :nyaize="'respect'"/>
 					<MkCwButton v-model="showContent" :text="note.text" :files="note.files" :poll="note.poll"/>
 				</p>
 				<div v-show="note.cw == null || showContent">
@@ -295,7 +295,7 @@ function boostVisibility() {
 	}
 }
 
-function renote(visibility: Visibility, localOnly: boolean = false) {
+function renote(visibility: Visibility, localOnly = false) {
 	pleaseLogin();
 	showMovedDialog();
 
diff --git a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
index b65fd9dd2..888dd19f5 100644
--- a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
+++ b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
@@ -44,6 +44,7 @@ type MfmProps = {
 	enableEmojiMenu?: boolean;
 	enableEmojiMenuReaction?: boolean;
 	isAnim?: boolean;
+	lang?: Misskey.entities.Note['lang'];
 };
 
 type MfmEvents = {
@@ -474,5 +475,6 @@ export default function (props: MfmProps, { emit }: { emit: SetupContext<MfmEven
 	return h('span', {
 		// https://codeday.me/jp/qa/20190424/690106.html
 		style: props.nowrap ? 'white-space: pre; word-wrap: normal; overflow: hidden; text-overflow: ellipsis;' : 'white-space: pre-wrap;',
+		lang: props.lang ?? undefined,
 	}, genEl(rootAst, props.rootScale ?? 1));
 }
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index 1dcc6c227..802a503d0 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -2272,6 +2272,9 @@ type IWebhooksShowResponse = operations['i/webhooks/show']['responses']['200']['
 // @public (undocumented)
 type IWebhooksUpdateRequest = operations['i/webhooks/update']['requestBody']['content']['application/json'];
 
+// @public (undocumented)
+export const languages: readonly ["ach", "ady", "af", "ak", "ar", "az", "bg", "bn", "br", "ca", "cak", "cs", "cy", "da", "de", "dsb", "el", "en", "eo", "es", "et", "eu", "fa", "ff", "fi", "fo", "fr", "ga", "gd", "gl", "gv", "he", "hi", "hr", "hsb", "ht", "hu", "hy", "id", "is", "it", "ja", "km", "kl", "kab", "kn", "ko", "kw", "la", "lb", "lt", "lv", "mai", "mk", "ml", "mr", "ms", "mt", "my", "no", "nb", "ne", "nl", "oc", "pa", "pl", "pt", "ro", "ru", "sh", "sk", "sl", "sq", "sr", "su", "sv", "sw", "ta", "te", "tg", "th", "fil", "tlh", "tr", "uk", "ur", "uz", "vi", "yi", "zh"];
+
 // @public (undocumented)
 type MeDetailed = components['schemas']['MeDetailed'];
 
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 0b685afc4..a761e36d6 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -4050,6 +4050,8 @@ export type components = {
       /** Format: date-time */
       deletedAt?: string | null;
       text: string | null;
+      /** @enum {string|null} */
+      lang: 'ach' | 'ady' | 'af' | 'ak' | 'ar' | 'ay' | 'az' | 'be' | 'bg' | 'bn' | 'br' | 'bs' | 'ca' | 'cak' | 'chr' | 'cs' | 'cy' | 'da' | 'de' | 'dsb' | 'el' | 'en' | 'eo' | 'es' | 'et' | 'eu' | 'fa' | 'ff' | 'fi' | 'fo' | 'fr' | 'fy' | 'ga' | 'gd' | 'gl' | 'gn' | 'gu' | 'gv' | 'grc' | 'he' | 'hi' | 'hr' | 'hsb' | 'ht' | 'hu' | 'hy' | 'id' | 'is' | 'it' | 'ja' | 'jv' | 'ka' | 'kk' | 'km' | 'kl' | 'kab' | 'kn' | 'ko' | 'ku' | 'kw' | 'la' | 'lb' | 'li' | 'lt' | 'lv' | 'mai' | 'mg' | 'mk' | 'ml' | 'mn' | 'mr' | 'ms' | 'mt' | 'my' | 'nan' | 'no' | 'nb' | 'ne' | 'nl' | 'nn' | 'oc' | 'or' | 'pa' | 'pl' | 'ps' | 'pt' | 'qu' | 'rm' | 'ro' | 'ru' | 'sa' | 'se' | 'sh' | 'si' | 'sk' | 'sl' | 'so' | 'sq' | 'sr' | 'su' | 'sv' | 'sw' | 'ta' | 'te' | 'tg' | 'th' | 'fil' | 'tlh' | 'tok' | 'tr' | 'tt' | 'uk' | 'ur' | 'uz' | 'vi' | 'xh' | 'yi' | 'yue' | 'zh' | 'zu' | 'zh-Hans' | 'zh-Hant';
       cw?: string | null;
       /** Format: id */
       userId: string;
@@ -19322,7 +19324,7 @@ export type operations = {
           birthday?: string | null;
           listenbrainz?: string | null;
           /** @enum {string|null} */
-          lang?: null | 'ach' | 'ady' | 'af' | 'af-NA' | 'af-ZA' | 'ak' | 'ar' | 'ar-AR' | 'ar-MA' | 'ar-SA' | 'ay-BO' | 'az' | 'az-AZ' | 'be-BY' | 'bg' | 'bg-BG' | 'bn' | 'bn-IN' | 'bn-BD' | 'br' | 'bs-BA' | 'ca' | 'ca-ES' | 'cak' | 'ck-US' | 'cs' | 'cs-CZ' | 'cy' | 'cy-GB' | 'da' | 'da-DK' | 'de' | 'de-AT' | 'de-DE' | 'de-CH' | 'dsb' | 'el' | 'el-GR' | 'en' | 'en-GB' | 'en-AU' | 'en-CA' | 'en-IE' | 'en-IN' | 'en-PI' | 'en-SG' | 'en-UD' | 'en-US' | 'en-ZA' | 'en@pirate' | 'eo' | 'eo-EO' | 'es' | 'es-AR' | 'es-419' | 'es-CL' | 'es-CO' | 'es-EC' | 'es-ES' | 'es-LA' | 'es-NI' | 'es-MX' | 'es-US' | 'es-VE' | 'et' | 'et-EE' | 'eu' | 'eu-ES' | 'fa' | 'fa-IR' | 'fb-LT' | 'ff' | 'fi' | 'fi-FI' | 'fo' | 'fo-FO' | 'fr' | 'fr-CA' | 'fr-FR' | 'fr-BE' | 'fr-CH' | 'fy-NL' | 'ga' | 'ga-IE' | 'gd' | 'gl' | 'gl-ES' | 'gn-PY' | 'gu-IN' | 'gv' | 'gx-GR' | 'he' | 'he-IL' | 'hi' | 'hi-IN' | 'hr' | 'hr-HR' | 'hsb' | 'ht' | 'hu' | 'hu-HU' | 'hy' | 'hy-AM' | 'id' | 'id-ID' | 'is' | 'is-IS' | 'it' | 'it-IT' | 'ja' | 'ja-JP' | 'jv-ID' | 'ka-GE' | 'kk-KZ' | 'km' | 'kl' | 'km-KH' | 'kab' | 'kn' | 'kn-IN' | 'ko' | 'ko-KR' | 'ku-TR' | 'kw' | 'la' | 'la-VA' | 'lb' | 'li-NL' | 'lt' | 'lt-LT' | 'lv' | 'lv-LV' | 'mai' | 'mg-MG' | 'mk' | 'mk-MK' | 'ml' | 'ml-IN' | 'mn-MN' | 'mr' | 'mr-IN' | 'ms' | 'ms-MY' | 'mt' | 'mt-MT' | 'my' | 'no' | 'nb' | 'nb-NO' | 'ne' | 'ne-NP' | 'nl' | 'nl-BE' | 'nl-NL' | 'nn-NO' | 'oc' | 'or-IN' | 'pa' | 'pa-IN' | 'pl' | 'pl-PL' | 'ps-AF' | 'pt' | 'pt-BR' | 'pt-PT' | 'qu-PE' | 'rm-CH' | 'ro' | 'ro-RO' | 'ru' | 'ru-RU' | 'sa-IN' | 'se-NO' | 'sh' | 'si-LK' | 'sk' | 'sk-SK' | 'sl' | 'sl-SI' | 'so-SO' | 'sq' | 'sq-AL' | 'sr' | 'sr-RS' | 'su' | 'sv' | 'sv-SE' | 'sw' | 'sw-KE' | 'ta' | 'ta-IN' | 'te' | 'te-IN' | 'tg' | 'tg-TJ' | 'th' | 'th-TH' | 'fil' | 'tlh' | 'tr' | 'tr-TR' | 'tt-RU' | 'uk' | 'uk-UA' | 'ur' | 'ur-PK' | 'uz' | 'uz-UZ' | 'vi' | 'vi-VN' | 'xh-ZA' | 'yi' | 'yi-DE' | 'zh' | 'zh-Hans' | 'zh-Hant' | 'zh-CN' | 'zh-HK' | 'zh-SG' | 'zh-TW' | 'zu-ZA';
+          lang?: null | 'ach' | 'ady' | 'af' | 'ak' | 'ar' | 'ay' | 'az' | 'be' | 'bg' | 'bn' | 'br' | 'bs' | 'ca' | 'cak' | 'chr' | 'cs' | 'cy' | 'da' | 'de' | 'dsb' | 'el' | 'en' | 'eo' | 'es' | 'et' | 'eu' | 'fa' | 'ff' | 'fi' | 'fo' | 'fr' | 'fy' | 'ga' | 'gd' | 'gl' | 'gn' | 'gu' | 'gv' | 'grc' | 'he' | 'hi' | 'hr' | 'hsb' | 'ht' | 'hu' | 'hy' | 'id' | 'is' | 'it' | 'ja' | 'jv' | 'ka' | 'kk' | 'km' | 'kl' | 'kab' | 'kn' | 'ko' | 'ku' | 'kw' | 'la' | 'lb' | 'li' | 'lt' | 'lv' | 'mai' | 'mg' | 'mk' | 'ml' | 'mn' | 'mr' | 'ms' | 'mt' | 'my' | 'nan' | 'no' | 'nb' | 'ne' | 'nl' | 'nn' | 'oc' | 'or' | 'pa' | 'pl' | 'ps' | 'pt' | 'qu' | 'rm' | 'ro' | 'ru' | 'sa' | 'se' | 'sh' | 'si' | 'sk' | 'sl' | 'so' | 'sq' | 'sr' | 'su' | 'sv' | 'sw' | 'ta' | 'te' | 'tg' | 'th' | 'fil' | 'tlh' | 'tok' | 'tr' | 'tt' | 'uk' | 'ur' | 'uz' | 'vi' | 'xh' | 'yi' | 'yue' | 'zh' | 'zu' | 'zh-Hans' | 'zh-Hant';
           /** Format: misskey:id */
           avatarId?: string | null;
           avatarDecorations?: ({
@@ -20977,6 +20979,8 @@ export type operations = {
            */
           visibility?: 'public' | 'home' | 'followers' | 'specified';
           visibleUserIds?: string[];
+          /** @enum {string|null} */
+          lang?: 'ach' | 'ady' | 'af' | 'ak' | 'ar' | 'ay' | 'az' | 'be' | 'bg' | 'bn' | 'br' | 'bs' | 'ca' | 'cak' | 'chr' | 'cs' | 'cy' | 'da' | 'de' | 'dsb' | 'el' | 'en' | 'eo' | 'es' | 'et' | 'eu' | 'fa' | 'ff' | 'fi' | 'fo' | 'fr' | 'fy' | 'ga' | 'gd' | 'gl' | 'gn' | 'gu' | 'gv' | 'grc' | 'he' | 'hi' | 'hr' | 'hsb' | 'ht' | 'hu' | 'hy' | 'id' | 'is' | 'it' | 'ja' | 'jv' | 'ka' | 'kk' | 'km' | 'kl' | 'kab' | 'kn' | 'ko' | 'ku' | 'kw' | 'la' | 'lb' | 'li' | 'lt' | 'lv' | 'mai' | 'mg' | 'mk' | 'ml' | 'mn' | 'mr' | 'ms' | 'mt' | 'my' | 'nan' | 'no' | 'nb' | 'ne' | 'nl' | 'nn' | 'oc' | 'or' | 'pa' | 'pl' | 'ps' | 'pt' | 'qu' | 'rm' | 'ro' | 'ru' | 'sa' | 'se' | 'sh' | 'si' | 'sk' | 'sl' | 'so' | 'sq' | 'sr' | 'su' | 'sv' | 'sw' | 'ta' | 'te' | 'tg' | 'th' | 'fil' | 'tlh' | 'tok' | 'tr' | 'tt' | 'uk' | 'ur' | 'uz' | 'vi' | 'xh' | 'yi' | 'yue' | 'zh' | 'zu' | 'zh-Hans' | 'zh-Hant';
           cw?: string | null;
           /** @default false */
           localOnly?: boolean;
@@ -22734,6 +22738,8 @@ export type operations = {
            */
           visibility?: 'public' | 'home' | 'followers' | 'specified';
           visibleUserIds?: string[];
+          /** @enum {string|null} */
+          lang?: 'ach' | 'ady' | 'af' | 'ak' | 'ar' | 'ay' | 'az' | 'be' | 'bg' | 'bn' | 'br' | 'bs' | 'ca' | 'cak' | 'chr' | 'cs' | 'cy' | 'da' | 'de' | 'dsb' | 'el' | 'en' | 'eo' | 'es' | 'et' | 'eu' | 'fa' | 'ff' | 'fi' | 'fo' | 'fr' | 'fy' | 'ga' | 'gd' | 'gl' | 'gn' | 'gu' | 'gv' | 'grc' | 'he' | 'hi' | 'hr' | 'hsb' | 'ht' | 'hu' | 'hy' | 'id' | 'is' | 'it' | 'ja' | 'jv' | 'ka' | 'kk' | 'km' | 'kl' | 'kab' | 'kn' | 'ko' | 'ku' | 'kw' | 'la' | 'lb' | 'li' | 'lt' | 'lv' | 'mai' | 'mg' | 'mk' | 'ml' | 'mn' | 'mr' | 'ms' | 'mt' | 'my' | 'nan' | 'no' | 'nb' | 'ne' | 'nl' | 'nn' | 'oc' | 'or' | 'pa' | 'pl' | 'ps' | 'pt' | 'qu' | 'rm' | 'ro' | 'ru' | 'sa' | 'se' | 'sh' | 'si' | 'sk' | 'sl' | 'so' | 'sq' | 'sr' | 'su' | 'sv' | 'sw' | 'ta' | 'te' | 'tg' | 'th' | 'fil' | 'tlh' | 'tok' | 'tr' | 'tt' | 'uk' | 'ur' | 'uz' | 'vi' | 'xh' | 'yi' | 'yue' | 'zh' | 'zu' | 'zh-Hans' | 'zh-Hant';
           cw?: string | null;
           /** @default false */
           localOnly?: boolean;