fix(appointments): properly localise the calendar events

[miaulalala]

Fixes #6156

[miaulalala]

/backport to stable4.7

[ChristophWurst]

Nice

Test will probably fail

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.97%. Comparing base (6d1a23d) to head (74df703).
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6163      +/-   ##
============================================
- Coverage     23.97%   23.97%   -0.01%     
  Complexity      457      457              
============================================
  Files           247      247              
  Lines         11605    11606       +1     
  Branches       2177     2188      +11     
============================================
  Hits           2782     2782              
- Misses         8508     8509       +1     
  Partials        315      315              

Flag	Coverage Δ
javascript	15.46% <ø> (ø)
php	59.53% <ø> (-0.03%)	⬇️

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[st3iny]

Test will probably fail

Nope, I guess we could need some tests for this case 😁

---

Php linter is not happy:

   1) lib/Service/Appointments/BookingCalendarWriter.php
      ---------- begin diff ----------
--- /home/runner/actions-runner/_work/calendar/calendar/lib/Service/Appointments/BookingCalendarWriter.php
+++ /home/runner/actions-runner/_work/calendar/calendar/lib/Service/Appointments/BookingCalendarWriter.php
@@ -14,7 +14,6 @@
 use OCP\Calendar\ICreateFromString;
 use OCP\Calendar\IManager;
 use OCP\IConfig;
-use OCP\IL10N;
 use OCP\IUserManager;
 use OCP\L10N\IFactory;
 use OCP\Security\ISecureRandom;

      ----------- end diff -----------