I had a brief chat with Dreadmox a while back on this subject (see: https://twitter.com/Dreadmox1/status/887396166756950016 ) and he confirmed that French and Spanish are available. Dreadmox claims only those are available but I doubt that has been looked into properly.
I did look into it, and Italian, Norwegian, Dutch, Danish, etc. doesn't work for NTSC, I don't know why it happens, I might post a vid on twitter about it, but it doesn't look like any PAL languages work for NTSC
I would've though that German, Italian and Portuguese were there based on some "most spoken langauges in us" lists but If this isn't the case and even Deutsch gives nothing there then I'll do only SPA/FRA/ENG analysis.
OK, Here it comes:
Any/100%: Start with Spanish. Change language to French after Run n' Bomb restart. Change language back to Spanish after Lemon Rage restart. Change language back to French after King of Fire restart. Change language back to Spanish after OP: Wedding Crasher. Continue with Spanish until the end of the run. This route loses to fastest PAL route by +5:08 (estimated), although the time save achieved with this route is only 10 seconds when compared to running only in Spanish.
All Jobs: Spanish (+4:40 to Norwegian)
MasterThief: Spanish (+0:02 to Norwegian)
Ultimate Gauntlet: Spanish
Episode 1: Spanish (+0:52 to Dutch)
Episode 2: French (+0:45 to Dutch)
Episode 3: Spanish (+1:00 to Norwegian)
Episode 4: French (+1:01 to Norwegian)
Episode 5: Spanish (+0:51 to Dutch)
Episode 6: Spanish (+0:10 to Dutch)