changed grammar

ps-grammar/restaurant/saveCommand.jsgf

 #JSGF V1.0;
 grammar restaurant_save_command;
 
-public <restaurant> = [tobi] [please] save ( <deliveryLocations> | <objectCategory> ) [[to | on] [the | my] ( <savePlaceLeft> | <savePlaceRight> )];
+public <restaurant> = [tobi] [please] save ( <deliveryLocations> | <objectCategory> ) [[to | on] [the | my]] ( <savePlaceLeft> | <savePlaceRight> | <savePlaceFront> | <savePlaceBack> );
+<savePlaceFront> = front;
+<savePlaceBack> = back;
 <savePlaceLeft> = left;
 <savePlaceRight> = right;
 <deliveryLocations> = table <numberOfTable>;