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

Conflicts:
- Dockerfile
  Took upstream version and reverted f13ebd02c91776ddb88b5178bf9015c6e0f1ca80.
  Hopefuly it's not needed anymore.
- app/controllers/api/v1/search_controller.rb
  The conflict was due to us raising the number of results returned.
  Upstream raised it further, so took it.
- config/locales/de.yml
  Took upstream changes to theme translation strings.
- config/locales/gl.yml
  Took upstream changes to theme translation strings.
- config/locales/nl.yml
  Took upstream changes to theme translation strings.
- config/locales/sk.yml
  Took upstream changes to theme translation strings.

diff --cc Gemfile
Simple merge

diff --cc Gemfile.lock
Simple merge

diff --cc app/javascript/mastodon/locales/defaultMessages.json
Simple merge

diff --cc app/javascript/mastodon/locales/en.json
Simple merge

diff --cc app/javascript/mastodon/locales/ja.json
Simple merge

diff --cc app/javascript/mastodon/locales/pl.json
Simple merge

diff --cc app/models/account.rb
Simple merge

diff --cc app/models/user.rb
Simple merge

diff --cc app/services/batched_remove_status_service.rb
Simple merge

diff --cc config/application.rb
Simple merge

diff --cc lib/mastodon/version.rb
Simple merge