I've found few issues, so far I'll report these:
-In camp, when you go to ally soldier to start briefing, the "Start briefing" action is not translated, it should be (I believe): "Rozpocznij odprawę".
-In Adapt campaign, mission "Nie do rozpoznania" when you read briefing before the mission in "Briefing -> Situation" tab or in polish version "Odprawa -> Sytuacja" tab the word "lotnicko" is misspelled, it should be "lotnisko" (s instead of c).
I remember during playing the campaign I've spotted something else, untranslated too, but I don't remember it right now. If I will find more issues I'll report them asap.
btw. Thanks BIS for fixing localization issues I've reported last time.