liblights: Fix dual blink mode and add amber long blink

Change-Id: Id229bc496a5702527a7095a8b48a9cd3a0e28ab7
EndeavoruParts: add option for button light notification.

Patch Set 2: Add and update German translation

Change-Id: Iff619609daa1cf2621dadab2dfb91b64f429c114