[LMS-1400] add hint

SVN: 15104

openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/grid/ExtendedGridView.java

@@ -62,7 +62,7 @@ class ExtendedGridView extends GridView
             };
         header.setSplitterWidth(splitterWidth);
         header.setMinColumnWidth(grid.getMinColumnWidth());
-        header.setTitle("[Click] to sort, [SHIFT+Click] to adjust width");
+        header.setTitle("[Click] to sort, [SHIFT+Click] to adjust the width");
         return header;
     }