LPS-50604 Remove stale reference to WikiPage in MessageBoards' service.xml file so that it compiles and run SB again
LPS-50604 Remove stale references to wiki in Asset's service.xml file so that it compiles and run SB again
LPS-51551 Simplify inner exceptions by using public final fields instead of getters - Apply to UserScreenNameException

Applying this new pattern we increase readability and reduce the file size by 25%