I agree, but you only found the tip of the issue. We also have tags for german, chinese, korean, japanese, farsi, arabic, and hebrew that I found in a quick search (there's likely more). I think any language-specific tag serves no on-topic purpose.
translation and localization would cover a lot of them, but there are language-related ramifications that warrant their own tags because they relate to specific technology questions. For example, we already have right-to-left. We also get a lot of questions dealing with "international" characters (e.g., how to enter, reproduce, or recognize them), international variations of keyboard layouts, etc., and we do have an international tag. It may take some digging to ferret out all of the tags and their uses, and identify appropriate on-topic tags.
A good way to approach this kind of retagging is to start and do the obvious ones and see what's left. Searches on keywords will turn up other tag examples. Once the obvious examples have been fixed, it's easier to see common uses in the residual questions that might have enough questions to warrant a new dedicated on-topic tag if one doesn't already exist.