It's not fully complete, this is what it looks like:
Doom and Doom 2: 100% complete
TNT Evilution: 100% complete
Heretic: 75% complete
Hexen: WIP
Chex Quest: 100% complete
Strife: Voices.wad dialogs not translated
There are other things that I couldn't translate (like the New Game screen) because there isn't anything like that on the language.ptb
Issues:
[DONE]TAG_FIST can't be edited, no matter what you put here (in language.enu is shown as brass knuckles, but in the game is just "Fist")-->>> can't be edited because it don't exist.
If someone knows how to edit "You defeated a Maximus!" string on Chex Quest 3, tell me.
Post here if you found other issues.
Download here: Just unpack it and add the file "language.ptb" to zdoom.pk3
Inside the game, open the console and input > language ptb
Tech notes: Version 0.97 12/07/2012
This is already added in the last version

EDIT: version 0.9 released (11/19/2012)
EDIT2: version 0.93 released (edited some parts on Chex Quest, for compatibility, use Chex Quest 3, available for free on Internet) (11/21/2012)
EDIT3: version 0.95 released (11/25/2012)
EDIT4: version 0.97 released (12/07/2012)
EDIT5: version 0.97 re-upped (will upload an update soon...)