Thx Shaun!
This was exactly what I did by myself.
the language file, no matter if I used english.lng or german-rel100.lng, screwed up my board ("parse error" and no text in forums).
The problem is the definition of the tooltip/Alt-text.
When adding i.E. $txt[chat] or $txt[750] I get an parse error two lines below and everything screws up.
If I abandon the ALT text everything works fine.
I can live without a tooltip on my chat button, but this strange.
5 minutes later:I modified the german.lng again and all of a sudden it works.
I have edited german.lng a hundred times before and was sure there was no mistake like a missing semicolon or the like. I was looking very thoroughly thru the 3 lines I had changed and they were ok!
How can this be then?