@Farmer-Ed hinted at the idea of “regional” convention IDs in the original thread:
Should convention IDs include a language code? eg: NRCS:pasture-condition-score-en:1.0?
Or, maybe some conventions will implicitly assume the language they are written in?
This question of localization is only a consideration where a convention requires you to enter specific strings. Quantity labels and units will probably be the most common places where this comes up…