[Hatredcopter]

The German language is doitsugo. In fact, any language in Japanese is just the country name followed by 'go'. Nihongo is Japanese, furansugo is French, supeingo is Spanish, etc. I guess the only exception is eigo for English.. I never did figure out the etymology of that word.

In Japanese, doitsugo is ドイツ語.

As for 'ro su a', I don't believe that's a country name. Are you sure it isn't 'ro shi a' (Russia)?