Implement validation of HeightStructuresInput: - Moved resource strings to the correct one - Changed validation messages for the standard deviation and the variation coefficient. Currently matches with the error messages that are generated by the distributions Related to Issue [WTI-925] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@6005 5a3db67b-de53-47b5-99c8-a1c30a6650e2