Update de.yml

I've gone through the whole thing again. Most of the typos should be out, and some things make more sense in the context on the map. Some things I've noticed though:
- I can't find the part about the BOARD OF AVDISORS in the german version to translate...?
- Under the ADD SOURCE tab: Types* is in english, but I can't that anywhere in the german code... all 'Type'-bits have a translation (Art), for some reason it just shows up in english. The same goes for the SEASON field: the 'to' and 'or' shows up in english, tough that might be hidden in the code somewhere. I didn't go through every 'to' and 'or' combination in the whole german code.
- For german and english: On the FRUITING STATUS bar, the first two categories overlap.
- Some fo the text (like about the dumpsters etc.) doesn't show up on the site yet, but it's missing in the english version as well. Are you planning to add that at some later point? Or am I just to stupid to find it? Is there a german fallingfruit.org/dumpster site?