Let email input field of login page autofocus

What does this MR do?

This MR causes the email input field of the login page to automatically be focused after page load so that one can immediately start typing.

How confident are you it won't break things if deployed?

99.4%

How to test

1. Checkout branch locally
2. Go to login page
3. The email input field should be focused automatically. If it contains text, it should be selected automatically.

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• set a "for:" label to indicate who will be affected by this change
• used "state:" labels to track this MR's state until it was beta tested
• added an entry to CHANGELOG.md
• added a short text that can be used in the release notes
• Once your MR has been merged, you are responsible to create a testing issue in Beta Testing Repo:
  • Consider writing a detailed description in German.
  • Describe in a few sentences, what should be tested from a user perspective.
  • Also mention different settings (e.g. different browsers, roles, ...) how this change can be tested.
  • Be aware, that also non technical people should understand.

Release notes text in German

Beim Laden der Login-Seite wird das E-Mail-Feld automatisch fokussiert