fix(appointments): Set organiser email to correct langauge

[miaulalala]

Fixes #6156

[miaulalala]

/backport to stable4.7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.01%. Comparing base (6bebd61) to head (7893c95).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6157      +/-   ##
============================================
+ Coverage     23.99%   24.01%   +0.01%     
  Complexity      457      457              
============================================
  Files           247      247              
  Lines         11576    11578       +2     
  Branches       2186     2185       -1     
============================================
+ Hits           2778     2780       +2     
- Misses         8483     8484       +1     
+ Partials        315      314       -1     

Flag	Coverage Δ
javascript	15.49% <ø> (ø)
php	59.56% <ø> (+0.03%)	⬆️

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[ChristophWurst]

backport?