[[Project:Translate extension|Translate extension]]

So... no interest/ideas/suggestions on those two points (priority pages and manual pages)?

I'm afraid translation isn't my area of expertise. It's been noted that "English is the working language of the Internet", though, and my attitude toward those who seek to administer websites tends to be, learn English or GTFO. But you seem to be on the right track as far as prioritization is concerned; focus on the most-viewed pages first.