Just as a comment set in a specific language is marked with a corresponding language flag, it should be possible to set tags in a specific language and mark those tags with the corresponding language flag.

Tags can be set only in the Terms list. However, tags are necessary per langauge, especially for export.
For example, I want all strings with a certain content to be exported. I can either export them exclusively if they are tagged or fuzzy. Setting them as "Fuzzy" is not helpful, since other unrelated strings may be marked as Fuzzy, too. I don't want to unmark for an unrelated purpose.

Example: In German sentences I want to export all strings that contain "Sie" instead of "Du" (formal vs informal "you"). I don't want to mark them as Fuzzy, since they are not wrong. I just want to export them and for this, I need to set a tag.

But to set tags, I need to go to the Terms list and search for "Sie". This, however, will also search in all other languages. So I have to go through all search results to see, wether "Sie" is included in the German translation or possibly in other translations.