Prepare Release 2.8.2

[vaszig]

Closes #4843 partly

Changes

• [x] Update Changelog
• [x] Bump version
• [ ] Pin SDK version

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [x] Checked copying a form
  • [x] Checked import/export of a form
  • [x] Config checks in the configuration overview admin page
  • [x] Problem detection in the admin email digest is handled

• Release management

  • [x] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [x] Commit messages refer to the relevant Github issue
  • [x] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.58%. Comparing base (fa41122) to head (5634199).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## stable/2.8.x #4845 +/- ## ============================================= Coverage 96.58% 96.58% ============================================= Files 746 746 Lines 25247 25247 Branches 3325 3325 ============================================= Hits 24384 24384 Misses 601 601 Partials 262 262 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

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