[de] ColorChooser demo - extra mnemonic keys are displayed

jdk8 b81
tested on Linux platforms (Ubuntu 10.04 x64, OEL 5.8 x64)

Steps to reproduce:
1. Run SwingSet2 demo
2. Choose 'JColorChooser' demo
3. Click on Background or Gradient1 or Gradient2 tab
4. In invoked 'Choose a Color' dialog box go to 'RGB' tab

String 'Green' ('Grun') has extra mnemonic key '(N)'. English version doesn't have it. Additionally on the Reset (Zurucksetzen) button extra mnemonic key implication '(Z)' is not needed.
Please refer to the attached screen shots.