I have read the job details carefully, as you stated in the description, you need a native belarussian to handle your project, (I am neither one but) I have delivered and done so many of it (Translating, proofreading and editing) and i can easily say that I put in my best and make it look perfect and professional and I will be willing to do the same to ensures you are 100% happy with the end result.
Message me for further discussion
Regards