It's much more intuitive than the world icon that is currently used. I agree though that it could be much better. Somebody with more graphical skills than me could replace the German flag with a UN flag, which would be better. But until this happens, I do suggest using those new icons, as if I were to see Shareaza for the first time in a language I wasn't able to speak, I most probably couldn't find the language change dialog, as the icon is not intuitive enough. (However, I do agree this is my personal opinion.)
So I'd kindly ask you to commit these icons while somebody of the community creates some cool new ones, replacing the German flag with a flag of the United Nations.
(For those people reading this post, YES, indeed, this is a request for YOU.)