Implements yadarts/yadarts-desktop/issues#18

- adding stack for player throws
- add according label in English and German
-
Shortened previously introduced constants of "missed" and "bounce out" to one character String

fixes yadarts/yadarts-desktop/issues#24
- extract some constants
- add curent player label on the right bar
- move round to the left bar
- add facilities for displaying finishing combinations on the right bar
add first german translation