release: v1.9.1

[limwa]

This PR releases the latest fixes to the master branch.

Review checklist

• [x] Terms and conditions reflect the current change
• [ ] Contains enough appropriate tests
• [x] If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• [x] Properly adds an entry in changelog.md with the change
• [x] If PR includes UI updates/additions, its description has screenshots
• [x] Behavior is as expected
• [x] Clean, well-structured code

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 7.50000% with 37 lines in your changes missing coverage. Please review.

Project coverage is 11%. Comparing base (0d7dbde) to head (f560739). Report is 35 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1330 +/- ## ====================================== + Coverage 11% 11% +1% ====================================== Files 268 268 Lines 7304 7330 +26 ====================================== + Hits 799 802 +3 - Misses 6505 6528 +23 ```