> As a technical and multi-language user of XWiki, how useful do you think adding translation for these would be Raphaël Jakse?
Quite useful. IMHO units should be translated like any other thing, not having them translated feel a bit like reading "Claude a couru 100 meters en 30 seconds". It feels a bit out of place. Software usually translate units, I don't see a good reason for XWiki not to do the same. I won't die on this hill neither though.
To me, it looks like you could quite easily introduce those translations keys like these and the code wouldn't be difficult to adapt: