Translation work really does take a lot more time than you would imagine. I've done some translations myself, and while you think you have a good grasp of the language you usually end up having to look a lot of things up to get the exact meaning of words and phrases to be certain you're translating correctly. Especially when it's for something real as this you get particularly conscious about doing a good job.

I think it's great that you've been asked to do it though, and hope they get their translation. Would be a great favour to those in the community whose english isn't very good.