Remove unused messages (#5924)

app/javascript/mastodon/locales/defaultMessages.json

@@ -264,39 +264,6 @@
     ],
     "path": "app/javascript/mastodon/components/status.json"
   },
-  {
-    "descriptors": [
-      {
-        "defaultMessage": "Toggle sound",
-        "id": "video_player.toggle_sound"
-      },
-      {
-        "defaultMessage": "Toggle visibility",
-        "id": "video_player.toggle_visible"
-      },
-      {
-        "defaultMessage": "Expand video",
-        "id": "video_player.expand"
-      },
-      {
-        "defaultMessage": "Sensitive content",
-        "id": "status.sensitive_warning"
-      },
-      {
-        "defaultMessage": "Click to view",
-        "id": "status.sensitive_toggle"
-      },
-      {
-        "defaultMessage": "Media hidden",
-        "id": "status.media_hidden"
-      },
-      {
-        "defaultMessage": "Video could not be played",
-        "id": "video_player.video_error"
-      }
-    ],
-    "path": "app/javascript/mastodon/components/video_player.json"
-  },
   {
     "descriptors": [
       {
@@ -711,15 +678,6 @@
     ],
     "path": "app/javascript/mastodon/features/compose/components/upload_button.json"
   },
-  {
-    "descriptors": [
-      {
-        "defaultMessage": "Undo",
-        "id": "upload_form.undo"
-      }
-    ],
-    "path": "app/javascript/mastodon/features/compose/components/upload_form.json"
-  },
   {
     "descriptors": [
       {
@@ -1076,15 +1034,6 @@
     ],
     "path": "app/javascript/mastodon/features/list_editor/components/search.json"
   },
-  {
-    "descriptors": [
-      {
-        "defaultMessage": "Search among follows",
-        "id": "lists.search"
-      }
-    ],
-    "path": "app/javascript/mastodon/features/list_editor/index.json"
-  },
   {
     "descriptors": [
       {