Engish-Polish editing and translation

We need someone to edit a Polish-English and English-Polish dictionary.
You must be fluent in both languages with a good knowledge of grammar and have experience from translation. The bidding price should be based upon 20 hours work, but it may be more, in that case we will increase the price with the same hourly rate.
You will receive the dictionary as Excel files and are expected to make it better by editing the existing text when there are faults, add new translations and make the dictionary better.