FxGroupAssignment#createEmptyData: fixed onlyRequiredGroups for "normal" groups

git-svn-id: http://svn.flexive.org/repository/flexive/trunk@2947 d35d4baa-7912-0410-b0ae-edacad209e15
FxValue: minor performance improvements, removed redundant multiLang field

git-svn-id: http://svn.flexive.org/repository/flexive/trunk@2948 d35d4baa-7912-0410-b0ae-edacad209e15
Storage: use the translated value's locale for the upper-case column used for case insensitive searches

git-svn-id: http://svn.flexive.org/repository/flexive/trunk@2949 d35d4baa-7912-0410-b0ae-edacad209e15