add momentjs translations, @lefnire this is a little cumbersome, the language is set server-side & momentjs languages are js functions so we can either load another javascript file in the browser or we can load the file content in window.env and execute it with eval which is what is used now. If you do not like this then feel free to revert the commit. It is useful for example for chat messages date and I will also add it to the repeat schedule so that we it is localized too