Migration to 6.2
Did the following:
Did not apply all pa_custom translations yet, since this needs to be
done at another time (themes should be migrated). Furthermore, since the
src did change, there may be additional translation adaptations
necessary. 
Thus, I removed all files who's only customization was a specific
translations. (Don't worry, I have a backup).
Also because of changes in the logic, the variables
bShowSubscriptions, bShowStatistics, bShowThreadNumberCol and
bShowThreadViewsCol could not be migrated directly.
TODO: