Bugfix - uploading post thumbnails.

I was not able to upload post thumbnail or browse my library for thumbnail.
In my errorlog I found:
"PHP Parse error:  syntax error, unexpected '=' in /*wordpressdir*/wp-includes/pomo/translations.php(171) : runtime-created function on line 1".
I think it is caused by translation file, because problematic expression was:
"($n==1  ? ( 0 ) : ( $n%10>=2 && $n%10< =4 && ($n%100<10 or $n%100>=20)  ? ( 1 ) : ( 2)))"
You just need to replace "< =" to "<=" and so on.
My locales are "pl_PL".

I know it's walkaway, but it works! :)