i18n: fixed wrong i18n call in users table.

rhodecode/templates/admin/users/users.html

@@ -106,7 +106,7 b''
       ],
       language: {
           paginate: DEFAULT_GRID_PAGINATION,
-          emptyTable: _gettext("No user_gettext(s available yet.")
+          emptyTable: _gettext("No users available yet.")
       },
       "initComplete": function( settings, json ) {
           get_datatable_count();