[i18n] updated polish translation for imp-cvs

[Jan Schneider]

Quoting "Przemyslaw \"Primo\" Witek" <primo at npl.pl>:

> Hi.
> After a long battle here it comes :)
> I've fixed all so it won't be a problem to compile it.

Did you talk to the last translator if he's fine with you taking over his
translation?

Jan.

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