release: v1.9.1

[limwa]

This PR releases the latest fixes to the master branch.

Review checklist

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

[codecov]

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

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