I found the problem...
The package '''myspell-pt''' (and maybe others), don't copy the '''pt.dic'''
and '''pt.aff''' files into '''/usr/share/myspell/dicts'''. And the installed
isn't compatible with Abrowser and I don't understand why (but that's not the
big problem here).
So here is the solution until a fix is found.
'''1 -''' Download the dictionary you want from this Mozilla webpage
'''2 -''' Open nautilus at the place where the .xpi file is, and extract it
using the usual tool for zip extraction.
'''3 -''' Open the terminal and go to the folder where the extracted files
are.
'''4 -''' Type this : '''sudo mv pt.{aff,dic} /usr/share/myspell/dicts'''
'''5 -''' Restart Abrowser and enjoy the Portuguese dictionary.
I hope this helped, I will try to see what is the problem with the myspell-pt
package.