App localisation / translation services needed, En-De

I am looking for a German native speaker and English to German professional translator to translate my Android App from English to German. The total number of words is aprox 6600, and there are some repetitions. The data comes in 3 columns (csv) for keys, English text and some comments / context, and I need a forth column for German version of the English text. After translation is complete, new text will be implemented in the App itself and the translator would need to spend some time for proofreading and QA, making sure everything makes sense (I would provide a checklist for this). If some parts of the localised text could be improved, translator would take a screenshot and send it to me with an improved version of the text. Some parts of the text are buttons, so it might be a challenge to find a corresponding word in German which would not be much longer than original. In addition to the scope of this project is a Google Play Listing translation (up to 4000 characters of translated text) and a few bullet points from screenshots in the Listing. The nature of the App is a Monopoly-style board game. Translator would need to own an Android device to be able to test the game. Total scope: 6600 words, proofreading and QA, up to 4000 characters (500 words) for Listing and screenshots.