Remove feature flags from lib/backup

Closes gitaly#749, gitaly#1212, and gitaly#1195

See merge request gitlab-org/gitlab-ce!20854

Rework performance section to allow for string freezing

See merge request gitlab-org/gitlab-ce!20969

Merge branch '48834-chart-versions-for-applications-installed-by-one-click-install-buttons-should-be-version-locked' into 'master'

Resolve "Chart versions for applications installed by one click install buttons should be version locked"

Closes #48834

See merge request gitlab-org/gitlab-ce!20765

Fix indentation for artifacts example in docs

See merge request gitlab-org/gitlab-ce!20971

Use Helm 2.7.2 for GitLab Managed Apps

Closes #49830

See merge request gitlab-org/gitlab-ce!20956

Resolve "Remove ghost notification settings for groups and projects"

Closes #44824

See merge request gitlab-org/gitlab-ce!20567

Update GITLAB_SHELL_VERSION to 8.1.0

See merge request gitlab-org/gitlab-ce!20975

Update two_factor_authentication.md

See merge request gitlab-org/gitlab-ce!20943

Enable frozen string in app/models/*.rb

See merge request gitlab-org/gitlab-ce!20851

Filter diff files by given path on DB instead Ruby

See merge request gitlab-org/gitlab-ce!20940

Resolve "Link to the runners page should automatically expand the runners settings"

Closes #49851

See merge request gitlab-org/gitlab-ce!20967

Refactor gitlab:import:repos task to remove direct disk access

Closes gitaly#953

See merge request gitlab-org/gitlab-ce!20864

Fix up VERSION for each of the applications
* There is no 0.0.1 helm version for jupyterhub. Use the latest version instead
* `:nginx` is not a valid chart version. Lock the ingress application GitLab installs to the latest chart version.
* Use the latest gitlab-runner chart to prevent GitLab installing older versions when users have been installing the lastest version

Always install from the VERSION and not the database `version` column.
This should fix cases like https://gitlab.com/gitlab-org/gitlab-ee/issues/6795 in
the instances where an install command failed previously, which locked the version
in the database to an older version.

Also, ensure that the version column is updated to the version we are
installing.

Add specs to show how previously failed appplications will be handled when the helm installation is run again

Add changelog entry

Relates to #47424

Add repository languages for projects

Closes #23931, #34671, #48647, and #47301

See merge request gitlab-org/gitlab-ce!19480

Add vanilla JS avatar_helper and update existing avatar helpers

See merge request gitlab-org/gitlab-ce!20886

Automatically expand runner's settings block when linking to the runner's settings page by using page anchor on the link

Backport CSS changes from gitlab-ee!6638

See merge request gitlab-org/gitlab-ce!20961

Resolve "Clean up changelog for 11.1.3 and 11.1.4"

Closes #49837

[ci skip]

See merge request gitlab-org/gitlab-ce!20962

Raise timeout for Karma tests to 2 seconds

See merge request gitlab-org/gitlab-ce!20963

Our friends at GitHub show the programming languages for a long time,
and inspired by that this commit means to create about the same
functionality.

Language detection is done through Linguist, as before, where the
difference is that we cache the result in the database. Also, Gitaly can
incrementaly scan a repository. This is done through a shell out, which
creates overhead of about 3s each run. For now this won't be improved.

Scans are triggered by pushed to the default branch, usually `master`.
However, one exception to this rule the charts page. If we're requesting
this expensive data anyway, we just cache it in the database.

Edge cases where there is no repository, or its empty are caught in the
Repository model. This makes use of Redis caching, which is probably
already loaded.

The added model is called RepositoryLanguage, which will make it harder
if/when GitLab supports multiple repositories per project. However, for
now I think this shouldn't be a concern. Also, Language could be
confused with the i18n languages and felt like the current name was
suiteable too.

Design of the Project#Show page is done with help from @dimitrieh. This
change is not visible to the end user unless detections are done.

Added gitlab-pages update instructions.

See merge request gitlab-org/gitlab-ce!19674

Fix bug setting http headers in Files API

See merge request gitlab-org/gitlab-ce!20938

Merge branch '49499-list-of-projects-not-loading-when-trying-to-create-an-issue-from-a-board-typeerror' into 'master'

Resolve "List of projects not loading when trying to create an issue from a board (TypeError)"

Closes #49499

See merge request gitlab-org/gitlab-ce!20955

Port of EE-translations

See merge request gitlab-org/gitlab-ce!20960

Allow users to set a status

Closes #35463

See merge request gitlab-org/gitlab-ce!20614

Resolve "Making instance-wide data tools more accessible"

Closes #41416 and #48507

See merge request gitlab-org/gitlab-ce!20874

New Crowdin translations

See merge request gitlab-org/gitlab-ee!6706

Remove fixes for MR refactor regressions from master

See merge request gitlab-org/gitlab-ce!20920