Merge branch 'master' into vue-docs

* master: (215 commits)
  Simplify Git interactions in AfterImportService
  Remove some empty lines from notify specs
  Validate unescaped `%` chars in PO files
  Optimize notification emails specs
  Fixed group merge requests failure
  Rollsback changes made to signing_enabled.
  Changed title on 404 page
  Changed message and title on the 404 page
  Make Gitaly PostUploadPack mandatory
  Use gitaly 0.36.0
  Instrument MergeRequest#fetch_ref
  /move project functionality. Squash commit.
  Remove closing external issues by reference error
  Fetch all translation keys using a regex
  Take `nplurals` into account when validating translations.
  Check for newlines in different methods on TranslationEntry
  Split translation & metadata entries into classes
  Validate the number of plurals in an entry
  Move detailed information of an entry into a separate class
  Move `PoLinter` into `Gitlab::I18n`
  ...

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