Translating a quest... well, it's the translation of an existing game from one language to an other one. I think every language will be welcome. How you do it... there's a guide here. If you need more detailed information I suppose you contact the solarus team: http://www.solarus-games.org/contact-form/
Ripping sprites means you extract them somehow from a game like, for example, A link to the past. You can find more information about that in the FAQ of this page.
Ripping sprites means you extract them somehow from a game like, for example, A link to the past. You can find more information about that in the FAQ of this page.