You can try to seek assistance in a translation site such as http://www.proz.com. This is a global site connecting clients and translators from around the world. Although there are few professional translators who understand advanced mathematics, such creatures may exist if you seek translation from a common language like French. You can register at the site and offer the job with all your conditions. Then you select the translator who suits you most.
I would not expect a high-quality result, but you can help the translator by providing her/him with the terminology of the subject field.
The down side is that it can cost you several hundred $, depending on the length of the paper.