The English-Na'vi translator almost NEVER produces correct sentences, so please do not use it unless you intend to joke
I was working on a translator for a bit, didn't get far.
We used to have http://dvi.clonk2c.ch/navi_translate.pl
but that is gone now. We have this, for those who didn't know: http://navi.tim32.org/
BUT please hear me out... if you actually want to learn the language, just don't bother using translators. (mostly because there is no better translator than a person who actually knows the language, machines are stupid xD)
The day I stopped using one, I actually started learning