Glossary Tools Menu: Scope of operation unclear

### Describe the issue

The three "Mark as" items are affecting the whole unit, i.e. "string + all translations"

But for the "Delete String" item, it is totally unclear whether it would delete the whole unit or just the translation. You tend to assumne that it affects the whole unit because that's whe the other items are doing as well, and most users are not even considering the possibility that single translation strings can be "deleted".

Start by reproducing the Glossary Tools Menu and compare the scope of the three “Mark as” actions with “Delete String.” Determine whether deletion affects the whole unit or one translation, then make the menu behavior or wording unambiguous and verify that the displayed scope matches the action.

Written by the indexing model from the issue text.