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

Conflicts:
	app/javascript/styles/mastodon-light.scss
	config/locales/en.yml
	config/locales/fr.yml
	config/locales/simple_form.pl.yml
	config/themes.yml

Conflicts resolved by deleting config/themes.yml,
marking app/javascript/styles/mastodon-light.scss as added,
and taking all new translation strings, not removing anything from
them.

app/javascript/mastodon/locales/defaultMessages.json

@@ -596,6 +596,14 @@
         "defaultMessage": "Local timeline",
         "id": "column.community"
       },
+      {
+        "defaultMessage": "Toots",
+        "id": "timeline.posts"
+      },
+      {
+        "defaultMessage": "Media",
+        "id": "timeline.media"
+      },
       {
         "defaultMessage": "The local timeline is empty. Write something publicly to get the ball rolling!",
         "id": "empty_column.community"
@@ -1393,6 +1401,14 @@
         "defaultMessage": "Federated timeline",
         "id": "column.public"
       },
+      {
+        "defaultMessage": "Toots",
+        "id": "timeline.posts"
+      },
+      {
+        "defaultMessage": "Media",
+        "id": "timeline.media"
+      },
       {
         "defaultMessage": "There is nothing here! Write something publicly, or manually follow users from other instances to fill it up",
         "id": "empty_column.public"