[PyQt] i18n() takes no unicode objects

[Christoph Burgmer]

Though it might seem unnecessary, i18n doesn't take unicode objects as input.
Though one would say English, the language which we would wrap i18n with, only 
needs ASCII, there might be occasions where other characters are needed.

Furthermore from Python 3.0 on unicode strings will be standard.

I can't find any other place for reporting this what I believe is a bug.

Cheers

Christoph