[Symptoms] Map all symptoms and generate them correctly in R

[JonasCir]

{'Fieber', 'Kopfschmerzen', 'Geruchssinnsverlust', 'Atemnot', 'Niesen', 'Husten', 'Halssschmerz', 'Müdigkeit', 'Durchfall', 'Schmerzen'}

• [ ] All of the above needs to be mapped
• [ ] Don't generate the strings in German