Classical format, here is a sequence of numbers, you need to find out how it continues:
5, 4, 14, 8, 0, 4, 2, 2, 2, 0, -3, -1, -2, -3, -7, -7, -6
This puzzle should also have the tag 'Germany' although that is not a valid tag for this Stack Exchange. No knowledge of the German language is needed to solve this puzzle.
The number 5 is really important for this puzzle.
Solving this is somewhat urgent. If there is no solution by the weekend I will have to adjust all the numbers.
The sequence and puzzle at it is written now is still valid until Friday evening (German time). I may update the sequence (and the really important number from Hint 1) on Sunday evening.