Added Polish translation

[tojatomasz]

the "songs" text on the Stats page is not getting translated to "Piosenki"
it works on other languages (tested DE and FR)
idk why :/

everything else is working atm

[theRealPadster]

Hmm, that is a very interesting issue. It seems to be using the english fallback for stats.songWithCount for Polish for some reason, like it's not detecting the _one and _other versions. It works if you manually load those strings.

[theRealPadster]

@tojatomasz
Does this make any sense to you? i18next/i18next#1851 (comment)
My guess is that Polish uses different pluralization keys than "one" and "other".

[theRealPadster]

Yes, that looks like it fixes it.

Could you add translations for the following keys? I'm not sure if it uses the "other" one but probably include it just in case.

"songWithCount_one": "{{count}} piosenka (one)",
"songWithCount_few": "{{count}} piosenek (few)",
"songWithCount_many": "{{count}} piosenek (many)",
"songWithCount_other": "{{count}} piosenek (other)",