Regression: not possible to delete source strings in Drupal (>7) interface translation

Tested #53 with php 8.1 and Drupal Core 9.5.4. Works perfectly both with single or multiple selections for delete.
RTBTC +1

Tested #53 with 9.5.9 and it works nicely

Same patch as #53 with a typo fixed.

I re-rolled #57 and created an MR for work going forward. The patch is the current state of the MR.

FYI Patch #57 works with the latest Drupal 10.1.6

But #59 can't be applied, maybe works only with the latest core dev?
Drush error: Could not apply patch! Skipping. The error was: Cannot apply patch https://www.drupal.org/files/issues/2023-12-02/2503893-59-fix-string-reg... →

Patch #59 is for the 11.x-dev branch, because that's the current commit target. It should also work with Drupal 10.2.x, which will be out in a few days.

Perhaps we should also test multiple deletion?

Drupal Usability Meeting 📌 Drupal Usability Meeting 2024-05-10 Active reviewed 🐛 Regression: not possible to delete source strings in Drupal (>7) interface translation Needs review

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For the record, the attendees at the usability meeting (Comment #64) were @AaronMcHale, @benjifisher, @rkoller, @shaal, @simohell, @skaught, and @worldlinemine.

We all agreed that the two submit buttons ("Save translations" and "Delete translations") were confusing. Given that, I do not think we should implement a confirmation form.

Deleting a translatable string is temporary. As soon as someone visits a page where the string is used, the string is re-added to the list of strings available for translation. This whole approach seems confusing from a usability perspective.

Opinions at the usability meeting were divided. Some of us were in favor of each of these proposals:

1. Close this issue as "won't fix".
2. Add a checkbox as in the current MR, but not a second submit button. When the form is submitted, the checkbox has the same effect as deleting the text in the "Translation for ..." column.
3. Add help text to clarify that deleting the translation means the source string will be used.