Make certain wordings translatable

[Jerome-Herbinet]

Just check commit.

Test from reviewers is need.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 23.59%. Comparing base (f874071) to head (3c97791). Report is 114 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6021 +/- ## ========================================= Coverage 23.59% 23.59% Complexity 457 457 ========================================= Files 246 246 Lines 11715 11715 Branches 2140 2140 ========================================= Hits 2764 2764 Misses 8637 8637 Partials 314 314 ``` | [Flag](https://app.codecov.io/gh/nextcloud/calendar/pull/6021/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | Coverage Δ | | |---|---|---| | [javascript](https://app.codecov.io/gh/nextcloud/calendar/pull/6021/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `15.18% <ø> (ø)` | | | [php](https://app.codecov.io/gh/nextcloud/calendar/pull/6021/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `58.61% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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[miaulalala]

Tests fail bc the new calls to l10n need to be added. I'll check in a minute and let you know where and how to add these :)

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