Are you allowed to put the same Adsense code on pages that aren't in English as you would on your English pages? Whenever I've seen it on non-English sites, even the "ads by Google" text was in the same language as the page.
Yes You Are. Google will identify de language and get the advertisers from that language /country. All my ads apear in Portuguese/Brasil.
you CAN put more than one adsense publisher id on one page, but you need to have express authorisation by google to do so. revenue sharing can be done without asking google if you make sure there's only one adsense publisher id per page display..