Explicitly set locale fallbacks

Closes #54274

See merge request gitlab-org/gitlab-ce!23271

Rails5 deprecation: :nothing option is deprecated, Use head method to respond with empty response body.

See merge request gitlab-org/gitlab-ce!23311

Correctly styles tags in jobs sidebar

Closes #54391

See merge request gitlab-org/gitlab-ce!23319

The tags were using the `label` class
instead of `bagde` which is the new BS class

Allow commenting to resolved non-diff discussions

Closes #54330

See merge request gitlab-org/gitlab-ce!23279

Add support for custom highlighting slash commands via warning flags

See merge request gitlab-org/gitlab-ce!23277

Rails5: env is deprecated and will be removed from Rails 5.1

Closes #54384

See merge request gitlab-org/gitlab-ce!22626

Clear BatchLoader context between Sidekiq jobs

Closes #53079

See merge request gitlab-org/gitlab-ce!23308

Update Runner Chart to 0.1.38

See merge request gitlab-org/gitlab-ce!23304

Include wildcard for `gitlab:assets:compile` only parameter

See merge request gitlab-org/gitlab-ce!23305

Documentation: Correct blocked SMTP ports for GKE

See merge request gitlab-org/gitlab-ce!23275

Add specs for entities autocomplete

Closes #48534

See merge request gitlab-org/gitlab-ce!23250

More env vars for group & project names in QA

See merge request gitlab-org/gitlab-ce!23303

Made diff file headers sticky

Closes #48816

See merge request gitlab-org/gitlab-ce!23249

This will help with https://gitlab.com/gitlab-org/gitlab-qa/issues/349
as we need to use much shorter project and group names for HTTPS to work

Add rails version to all migrations

Closes #54098

See merge request gitlab-org/gitlab-ce!23057

Show toggle tree button on merge request commits

Closes #53019

See merge request gitlab-org/gitlab-ce!23238

Limit `gitlab:assets:compile` job to branches and tags

Closes #54361

See merge request gitlab-org/gitlab-ce!23302

Fix typos occured to occurred

See merge request gitlab-org/gitlab-ce!23105

Resolve "`fetch-assets` job times out so `package-and-qa` jobs can't complete"

Closes #54293

See merge request gitlab-org/gitlab-ce!23267

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/48816

DB schema generated by a migration may look different in
rails 4 and 5 (because rails 5 may use different default values).
For this reason it's important to explicitly set for which rails
version a migration was written for.

See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912

When switching to rails 5, we added migration version to all migration
classes. This patch makes it possible to run versioned migrations
also with rails 4

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53019

Fix markdown to render correctly

See merge request gitlab-org/gitlab-ce!23221

Remove broken link that 404s and has no alternative

See merge request gitlab-org/gitlab-ce!23295

SystemCheck: Use a more reliable way to detect current Ruby version

Closes #46950

See merge request gitlab-org/gitlab-ce!23291

Revert "Merge branch 'revert-e2aa2177' into 'master'"

Closes #54267

See merge request gitlab-org/gitlab-ce!23237

Add cop prohibiting params argument in url_for

Closes #47986

See merge request gitlab-org/gitlab-ce!23115