アイヌ語追加 (#428) (#433)

Reviewed-on: #433
Co-authored-by: miteruzo <miteruzo@naver.com>

frontend/src/components/PostList.tsx

@@ -3,6 +3,7 @@ import { useRef } from 'react'
 import { useLocation } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import { useUITranslation } from '@/lib/useUITranslation'
 import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { cn } from '@/lib/utils'
 import { useSharedTransitionStore } from '@/stores/sharedTransitionStore'
@@ -16,6 +17,7 @@ type Props = { posts:     Post[]
 
 
 const PostList: FC<Props> = ({ posts, onClick }) => {
+  const { label } = useUITranslation ('shared')
   const location = useLocation ()
   const behaviourSettings = useClientBehaviourSettings ()
   const thumbnailMode = behaviourSettings.thumbnailMode ?? 'normal'
@@ -75,7 +77,7 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 		   ? (
 		      <div className="flex h-full w-full items-center justify-center
 				      bg-muted text-center text-xs text-muted-foreground">
-			サムネイルなし
+			{label ('labels.noThumbnail')}
 		      </div>)
 		   : (
 		      <img