HV-725 Updating po and pot files. Making some minor reviewing changes
HV-725 Minor fixes to chapter 3
HV-725 Minor fixes
HV-725 Adding section on CDI to integration chapter
HV-725 Adding section on Java EE to integration chapter
HV-725 Updating groups chapter
HV-725 Updating custom constraints chapter
HV-725 Misc. fixes and clean-ups
HV-604 Adding section on implementation of class-level constraints