Qiaeru It's based on Moment.js, so you have to add customize a bit the locale file content and add it in a locale/config.js file of your language pack (see the French locale for example, compared to the original one).
Dominion Oh rats, did I miss something? I'll have a look at it as soon as I get a chance. Qiaeru (and everyone): Please feel free to create an issue about any hardcoding I missed here.
Qiaeru You're welcome. I think that's all concerning the UI. Note that installation pages are also not localizable at this time.