ci: Enable translation backports

[ChristophWurst]

Ref https://docs.nextcloud.com/server/latest/developer_manual/basics/front-end/l10n.html#setup-of-the-transifex-sync

We use this for Contacts and Mail too and it seems to work well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.33%. Comparing base (56ee073) to head (a705963).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6511   +/-   ##
=========================================
  Coverage     23.33%   23.33%           
  Complexity      453      453           
=========================================
  Files           248      248           
  Lines         11777    11777           
  Branches       2257     2257           
=========================================
  Hits           2748     2748           
  Misses         8705     8705           
  Partials        324      324           

Flag	Coverage Δ
javascript	14.95% <ø> (ø)
php	59.29% <ø> (ø)

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