AniDB

I'd like to know if it's alright to add in episode titles of a particular anime in a different language. I can submit it in French or Italian as it is, or I can use one of those website translators (i think) and change it to English, but I can't confirm its accuracy since I know neither language. So I'm also wondering which method is more preferred.

The prefered method is to look for an official source which lists the titles in english and then c&p them into the db.

you can add episode titles in different languages, but only to the description field of the episode. there is no special field for other languages than english and japanese (romaji and kanji) point is it's nowhere else visible, but if you open the episode entry. though no one will stop you from doing so.

as for the english titles. please refrain from using a autotranslator. if english titles get added it's prefered to use the official titles. that goes for every language btw.