WCM-98 Fix contribution docs
WCM-157 Use right escape method
WCM-122 minor improvement in language key
WCM-122 remove not used language keys
WCM-162 obtain campaign Query Rules by priority too
WCM-16 Julio's original Javadoc
WCM-16 Edit Javadoc
WCM-16 Edit Javadoc to correct what activate/deactivate methods accomplish