I have been offered several links on PR8 sites from other coutnries that are not written in English like my site. Will Google give me any PR from these sites?
The links may give you PR juice so your PR should rise from it but in terms of search engine ranking, it would have little effect.
Are those non english sites based on same topic as your site then i think yes you won the link lottery.
Yes it will, better still if its the same niche and the pagerank of the page is important not of the website.
Are you really gonna get PR8 backlinks (from homepages I guess)? That might somewhat help your site, the best if they are related to your site. Related or not, one best thing to take advantage is to create more contents and pages so the indexing boosts those backlinks might bring would add up on indexing more of your entire site.
a good PR8 website will really help you.be careful to check if the PR is valid.and check to what other websites is linking (the number of the outgoing links and also what kind of websites) you can check the number of the backlinks also,and if it listed on DMOZ,yahoo directory (that should give more trust) the domain age is also important good luck