German translation

I would like to help translating the game to German.

First off I simply forked the project and added some po-file with translated text. Yet I'm not experienced in translation tasks so I do not know what else is needed here. For example there are two glyphs missing, the "ä" and "Ü" in the png-files which seem to define the font. But I do not know how the png and fnt files work. Are there special tools to edit them?

Then, afterwards, how complicated is it to compile a test build?