[enh] update translations

I have update the translations on transifex, and also inside searx (this pull request)

@asciimoo  It is nice if you translate missing words, but please do not use only a translator :).
For Example: en:"Leecher" --> de"Zecke" I think nobody in germany/austria would name a p2p leecher "Zecke" (en:"Tick"), even when it is a good paraphrasing ^^