Initial work: Consolidate translatable strings into one file.

I've created a std::map which holds almost all of the possible strings that need to be translated. Using this table should make it much easier to keep track of what needs to be updated in translation INI files instead of having to look around the source code for all signs of ->T(". I've left the old UI untouched, as I wasn't sure if it's even going to be around much longer.