Topic: Implementing an "unnecessary_translation" tag?

I can't seem to find a tag that fits for this

In my endeavor to translate/check spanish_text posts not tagged as translated I've come across a few special posts that don't necessarily need a translation

post #1791270 post #776236 post #1526569
Spanish words that have no translation, background pictures that don't need translation for the reader to understand the picture, etc

I'm curious if I would be in the wrong to implement such a tag or if it's too niche to be practical

Updated by Chaser