Load list of all repositories dynamically, get list of locales from txt files, use Aurora as default

Note: will need to run setup.sh once on the beta server once merged (maybe we should add it to the hook?).

Instead of hard-coding the list of repositories, code will now extract the list of repositories, their names and their displaying order from the external web service.

Also switched to 'aurora' as default, since 'central' will now have a very short list of locales (kept the commit separate for clarity).