RxFPC:start work on export RxDBGrid groups to spreadsheet

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5949 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/rx/trunk/rxtools/rxdconst.pas

@@ -188,6 +188,7 @@ resourcestring
   sExportSelectedRows        = 'Export only selected rows';
   sExportHideZeroValues      = 'Hide zero values';
   sMergeCells                = 'Merge cell''s';
+  sExportGroupData           = 'Export group data';
   sOverwriteExisting         = 'Overwrite existing';
   sShowColumnHeaderOnAllPage = 'Show column header on all pages';
   sPageMargins               = 'Page margins';