Ajaxify the user interface translation forms

Bunch of updates, implements the _wrapper_format=drupal_htmx to reduce the size and contents of the ajax requests

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

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