Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/models/status.rb

Resolved by taking both changes (not a real conflict, just changes too close
to each other).

app/javascript/mastodon/locales/ja.json

@@ -326,7 +326,7 @@
   "status.show_less_all": "全て隠す",
   "status.show_more": "もっと見る",
   "status.show_more_all": "全て見る",
-  "status.show_thread": "続きを読む",
+  "status.show_thread": "スレッドを表示",
   "status.unmute_conversation": "会話のミュートを解除",
   "status.unpin": "プロフィールの固定表示を解除",
   "suggestions.dismiss": "隠す",