panel: rename label on csv export modal

public/app/features/dashboard/export_data/export_data_modal.html

@@ -23,7 +23,7 @@
         <input type="text" class="gf-form-input" ng-model="ctrl.dateTimeFormat">
       </div>
       <gf-form-switch class="gf-form"
-        label="Export To Excel" label-class="width-12" switch-class="max-width-6"
+        label="Excel CSV Dialect" label-class="width-10" switch-class="max-width-6"
         checked="ctrl.excel">
       </gf-form-switch>
     </div>