It was said, that polish language will no longer be supported, because there were just a few players.
Polish people can use the english, german, french launcher and forum
Polish players are probably 4th - 5th biggest nation in game (after French, Germans and Americans and maybe English) so I don't now how you can call it "a few players"
The real problem behind this post is that there was Polish client (and Polish server) before (I also used it), and there was no official statement that it won't be continued.
We had about 15 ppl on P2P from Ploand. So i think the localisation would not be worth the costs.
Basing on p2p server population there is no localisation worth the costs
And you made typo - its Poland
But I'm really happy that I have English client now - so easy to communicate and discuss builds, quests and so on.
It should be just English in my opinion.