Create translation string for backlink in subtitles settings

src/assets/locales/en.json

@@ -178,6 +178,7 @@
         "title": "Subtitles",
         "customizeLabel": "Customize",
         "settings": {
+          "backlink": "Custom Subtitles",
           "fixCapitals": "Fix capitalization",
           "delay": "Caption delay"
         },

src/components/player/atoms/settings/CaptionSettingsView.tsx

@@ -229,7 +229,7 @@ export function CaptionSettingsView({ id }: { id: string }) {
   return (
     <>
       <Menu.BackLink onClick={() => router.navigate("/captions")}>
-        Custom Subtitles
+        {t("player.menus.subtitles.settings.backlink")}
       </Menu.BackLink>
       <Menu.Section className="space-y-6">
         <CaptionSetting