ref #9204 upgrade and remove further libraries in taxeditor (including commons-lang und unitils)
fix #9040: adapt preferences to availableFor attribute of features
fix #8943: fix handling of term preferences in combo boxes and code cleaning
avoid NPE in preferenceUtil and TermPreferencePages
ref #8562: continue work on preference pages
ref #8562: add admin preference page for multilanguage support
ref #8568: performance issues for term and voc preference pages