verbiage: "Apply", not "Save" (betaflight#705)

index.html

@@ -685,7 +685,7 @@ <h4 class="modal-title">Configure graphs</h4>
                     <button type="button" class="btn btn-default graph-configuration-dialog-cancel" data-dismiss="modal" data-toggle="tooltip"
                         title="Close without saving changes">Cancel</button>
                     <button type="button" class="btn btn-primary graph-configuration-dialog-save" data-dismiss="modal" data-toggle="tooltip"
-                        title="Close and save changes">Save changes</button>
+                        title="Close and save changes">Apply changes</button>
                 </div>
             </div>
         </div>