Merge remote-tracking branch 'origin/master' into gs-master

Conflicts:
 	app/controllers/home_controller.rb
 	app/controllers/stream_entries_controller.rb
 	app/javascript/mastodon/locales/ja.json
 	app/javascript/mastodon/locales/pl.json

app/javascript/mastodon/locales/en.json

@@ -245,6 +245,7 @@
   "search_results.total": "{count, number} {count, plural, one {result} other {results}}",
   "standalone.public_title": "A look inside...",
   "status.block": "Block @{name}",
+  "status.cancel_reblog_private": "Unboost",
   "status.cannot_reblog": "This post cannot be boosted",
   "status.delete": "Delete",
   "status.direct": "Direct message @{name}",
@@ -260,6 +261,7 @@
   "status.pin": "Pin on profile",
   "status.pinned": "Pinned toot",
   "status.reblog": "Boost",
+  "status.reblog_private": "Boost to original audience",
   "status.reblogged_by": "{name} boosted",
   "status.reply": "Reply",
   "status.replyAll": "Reply to thread",