Fixed T25317
Fixed T25317

added accent color. Picked complement color of accent color in dark theme for now.

Signed-off-by: Ralf Floca <fec4a647ab34f54e20bea9a9e3e1c74f13aefc78@dkfz-heidelberg.de>

MITK/MITK,fmilano/mitk,MITK/MITK,MITK/MITK,fmilano/mitk,MITK/MITK,fmilano/mitk,fmilano/mitk,fmilano/mitk,MITK/MITK,fmilano/mitk,MITK/MITK,fmilano/mitk