I installed TexnicCenter 2.02 together with the Polish dictionary. In options -> spelling the language chosen is Polish. Unfortunately, it seems that the English dictionary is still in use. TexnicCenter does not recognize Polish words and suggests English words.
In TexnicCenter 1.0, I managed to install a Polish dictionary (though it required manually changing its encoding to Windows1250) and it works just fine. I tried copying dictionary files from TexnicCenter 1.0 to TexnicCenter 2.02, but to no avail