Correct 40 articles about French, German or Spanish

Hello, I have a batch of 40 articles(in English) about the French, German and Spanish languages and I am looking for some people to correct them. They contain some typos here and there(both in English as in the target language), and an occasional error. The ideal candidate is a French, German or Spanish tutor(depending on the batch you're bidding on), or at least native speaker, with a sound knowledge of English. You need to correct the articles themselves and maintain a separate list with changes you made(a simple txt file is ok), so I can start from the originals and reapply your changes myself as I see fit. In every batch of 40 articles I will also plant 5 errors myself, so I can check easily on the quality of the corrections. I will only accept a corrected batch of articles in which at least 4 of these 5 errors are gone. Every batch of these articles I had made on this site for about 100$. Correcting them is more specialized work, but should take a lot less time(maybe 4 times less time, no writing required, it is a proofread job), so I was thinking of a budget of 65$ for one batch. If you bid, please state clearly for which batch you are bidding(French, German or Spanish). I also attached a sample article file for each language to this project description, so you can get an idea what one of these (usually 400 word) articles look like. If you bid, please also tell me a bit about yourself.