fix(core): add translations on the login page

[ShGKme]

• Resolves: [BITV] 9.3.1.1/1.1 - Even though the page is in English, the "lang" attribute is set to the value for the German language, which leads to incorrect screen reader output (1) #41881
  • Includes: [BITV] 9.2.4.2/1.1 - Even though the page is in the English language, the individual page name inside the title element is in German.- <title>Anmelden – Nextcloud</title>. (1) #41874

Summary

• Not sure, but it seems to be a regression from: Add a separate event for login page rendering #39867

Login form has translations from core app.

script('core') on the login template doesn't load translations because addScript ignores translations for the core app. Translations should be loaded implicitly.

Before Util::addTranslations('core'); was always a part of initTemplateEngine, but it was changed on the mentioned PR.

Screenshots

Before	After

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[ShGKme]

BTW, this part seems to be unneeded now:

https://github.com/nextcloud/server/blob/7b6877b278f25f76c6e909e74ce188ba6a65e306/core/src/login.js#L28C1-L29

[ShGKme]

/backport to stable28

[nickvergessen]

🙈

[ShGKme]

Drone is unrelated, but I have no rights to restart it.

[skjnldsv]

/backport to stable28