English to Dutch tranlsation

We build social application on dutch social network Hyves . The applications are created in English and then translated to dutch . I need to get existing dutch translations proofread and some new English phrases translated. . I estimate that about 3000-4000 words need to be proofread and corrected and about 2000 words need to be translated. The person must be a native dutch speaker from holland and an active user of Hyves social network. This is an ongoing job so we are looking for someone who is highly professional and prompt to help us out on a regular basis. I will provide a Microsoft excel sheet with 400 English questions that need to be translated to Dutch.