Ill look on civs culture designation and send fix what should be fixed.
As for voices - I cut everything except xml and leader/civ art files from my megapack. No voices, no flavor units etc. I made this because I want to made megapack playable (without memory crashes) in C2C.
BUT as I know that polish civ community is rather big I prepared special, polish pack for C2C, including 5 new leaders (Boleslaw Chrobry, Kazimierz Wielki, Jan III Sobieski, Jozef Pilsudski, Lech Walesa), complete flavour unit pack (tons of models and textures) and voice pack (diplo music and unit voice pack). Pack is nearly done, I just need to end XML work and start testing. If everything will be ok then Ill be ready to publish this set in the end of the April.