Added: cache to EntityManager #173
Added: support for clearing cache #174 and #173
Added: clear cache on logout #174
Updated: Serialization to underlying date format String instead of name for EnumDateFormat #175
Fixed: syntax error (for #173 / #174)
Added: message visualization for #116
Added: full message displaying for #116
Added: copyright-info (but still old year) #88
Added: styles for #116
Fixed: labels are now filled with textnodes instead of using innerHTML #180
Fixed: Unicode-Characters for #180
Fixed: not reenabling register button #179