(svn r21963) -Fix: saying something twice in an error message is not needed

src/lang/english.txt

@@ -3597,7 +3597,7 @@ STR_ERROR_AIRCRAFT_MUST_BE_STOPPED_INSIDE_HANGAR                :{WHITE}... must
 STR_ERROR_TRAINS_CAN_ONLY_BE_ALTERED_INSIDE_A_DEPOT             :{WHITE}Trains can only be altered when stopped inside a depot
 STR_ERROR_TRAIN_TOO_LONG                                        :{WHITE}Train too long
 STR_ERROR_CAN_T_REVERSE_DIRECTION_RAIL_VEHICLE                  :{WHITE}Can't reverse direction of vehicle...
-STR_ERROR_CAN_T_REVERSE_DIRECTION_RAIL_VEHICLE_MULTIPLE_UNITS   :{WHITE}Can't reverse direction of vehicles consisting of multiple units...
+STR_ERROR_CAN_T_REVERSE_DIRECTION_RAIL_VEHICLE_MULTIPLE_UNITS   :{WHITE}... consists of multiple units
 STR_ERROR_INCOMPATIBLE_RAIL_TYPES                               :Incompatible rail types
 
 STR_ERROR_CAN_T_MOVE_VEHICLE                                    :{WHITE}Can't move vehicle...