Is the "Language" item in the profile merely informational?
There are no available translations of ZFGC, which means the language chosen does not affect the layout of the forum.
So it would only be useful in case you want to know the first language of a certain member (by looking at his or her profile). But if this is the case, wouldn't it be better if you could choose any existent natural language, instead of only one of the 5 standard options (English, German, Dutch, Spanish and Japanese), or maybe more than only one language? It could be similar to the "Location" item: we just type the language(s) name(s) instead of choosing an option.