Fix/Contact subtitle encoding

[GVodyanov]

Fix #3720

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9f8fac8) 2.13% compared to head (7a830aa) 2.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##              main   #3755      +/-   ##
==========================================
+ Coverage     2.13%   2.51%   +0.38%     
==========================================
  Files          113      89      -24     
  Lines         5193    4409     -784     
  Branches      1125    1125              
==========================================
  Hits           111     111              
+ Misses        4962    4178     -784     
  Partials       120     120              

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[GretaD]

works :)

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/contacts/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[GretaD]

do we need a backport here?