Hi nant,
Thanks for reply, i went to documentation and found a lot of good information!
I created a pack for brazilian portuguese!
using brazilian in the place of english and doing all modifications recomended!
brazilian.php , etc...
I installed with success!
before doing the brazilian pack, i did some tests with the english pack, and it worked only if i set english as defaut language of my joomla web site.
Than i decided to make the brazilian pack to work with brazilian as defaut joomla language.
Thanks