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

Conflicts:
- `app/models/form/admin_settings.rb`:
  New setting added upstream. Ported it.
- `app/views/statuses/_simple_status.html.haml`:
  Upstream removed RTL classes. Did the same.
- `config/settings.yml`:
  New setting added upstream. Ported it.

config/initializers/paperclip.rb

@@ -113,3 +113,14 @@ else
 end
 
 Paperclip.options[:content_type_mappings] = { csv: Import::FILE_TYPES }
+
+# In some places in the code, we rescue this exception, but we don't always
+# load the S3 library, so it may be an undefined constant:
+
+unless defined?(Seahorse)
+  module Seahorse
+    module Client
+      class NetworkingError < StandardError; end
+    end
+  end
+end