release: v1.9.7

[limwa]

Releases v1.9.7

Superseedes #1408.

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 4.02685% with 143 lines in your changes missing coverage. Please review.

Project coverage is 12%. Comparing base (1440ac1) to head (2ab22e4).
Report is 167 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1410   +/-   ##
======================================
+ Coverage      11%     12%   +1%     
======================================
  Files         267     264    -3     
  Lines        7325    7238   -87     
======================================
+ Hits          802     803    +1     
+ Misses       6523    6435   -88