Split timetable clear/set speed/wait time tooltip strings

This is to separate the original strings from added suffixes

src/lang/english.txt

@@ -5631,16 +5631,20 @@ STR_TIMETABLE_STARTING_DATE                                     :{BLACK}Start da
 STR_TIMETABLE_STARTING_DATE_TOOLTIP                             :{BLACK}Select a date as starting point of this timetable. Ctrl+Click sets the starting point of this timetable and distributes all vehicles sharing this order evenly based on their relative order, if the order is completely timetabled
 
 STR_TIMETABLE_CHANGE_TIME                                       :{BLACK}Change Time
-STR_TIMETABLE_WAIT_TIME_TOOLTIP                                 :{BLACK}Change the amount of time that the highlighted order should take (Ctrl+Click sets waiting time for all orders)
+STR_TIMETABLE_WAIT_TIME_TOOLTIP                                 :{BLACK}Change the amount of time that the highlighted order should take
+STR_TIMETABLE_WAIT_TIME_TOOLTIP_EXTRA                           :{BLACK}{STRING} (Ctrl+Click sets the time for all orders)
 
 STR_TIMETABLE_CLEAR_TIME                                        :{BLACK}Clear Time
-STR_TIMETABLE_CLEAR_TIME_TOOLTIP                                :{BLACK}Clear the amount of time for the highlighted order (Ctrl+Click clears the amount of time for all orders)
+STR_TIMETABLE_CLEAR_TIME_TOOLTIP                                :{BLACK}Clear the amount of time for the highlighted order
+STR_TIMETABLE_CLEAR_TIME_TOOLTIP_EXTRA                          :{BLACK}{STRING} (Ctrl+Click clears the time for all orders)
 
 STR_TIMETABLE_CHANGE_SPEED                                      :{BLACK}Change Speed Limit
-STR_TIMETABLE_CHANGE_SPEED_TOOLTIP                              :{BLACK}Change the maximum travel speed of the highlighted order (Ctrl+Click set the speed for all orders)
+STR_TIMETABLE_CHANGE_SPEED_TOOLTIP                              :{BLACK}Change the maximum travel speed of the highlighted order
+STR_TIMETABLE_CHANGE_SPEED_TOOLTIP_EXTRA                        :{BLACK}{STRING} (Ctrl+Click sets the speed for all orders)
 
 STR_TIMETABLE_CLEAR_SPEED                                       :{BLACK}Clear Speed Limit
-STR_TIMETABLE_CLEAR_SPEED_TOOLTIP                               :{BLACK}Clear the maximum travel speed of the highlighted order (Ctrl+Click clears the speed for all orders)
+STR_TIMETABLE_CLEAR_SPEED_TOOLTIP                               :{BLACK}Clear the maximum travel speed of the highlighted order
+STR_TIMETABLE_CLEAR_SPEED_TOOLTIP_EXTRA                         :{BLACK}{STRING} (Ctrl+Click clears the speed for all orders)
 
 STR_TIMETABLE_RESET_LATENESS                                    :{BLACK}Reset Late Counter
 STR_TIMETABLE_RESET_LATENESS_TOOLTIP                            :{BLACK}Reset the lateness counter, so the vehicle will be on time

src/timetable_gui.cpp

@@ -517,6 +517,38 @@ struct TimetableWindow : Window {
 		}
 	}
 
+	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override
+	{
+		switch (widget) {
+			case WID_VT_CHANGE_TIME: {
+				uint64 params[1];
+				params[0] = STR_TIMETABLE_WAIT_TIME_TOOLTIP;
+				GuiShowTooltips(this, STR_TIMETABLE_WAIT_TIME_TOOLTIP_EXTRA, 1, params, close_cond);
+				return true;
+			}
+			case WID_VT_CLEAR_TIME: {
+				uint64 params[1];
+				params[0] = STR_TIMETABLE_CLEAR_TIME_TOOLTIP;
+				GuiShowTooltips(this, STR_TIMETABLE_CLEAR_TIME_TOOLTIP_EXTRA, 1, params, close_cond);
+				return true;
+			}
+			case WID_VT_CHANGE_SPEED: {
+				uint64 params[1];
+				params[0] = STR_TIMETABLE_CHANGE_SPEED_TOOLTIP;
+				GuiShowTooltips(this, STR_TIMETABLE_CHANGE_SPEED_TOOLTIP_EXTRA, 1, params, close_cond);
+				return true;
+			}
+			case WID_VT_CLEAR_SPEED: {
+				uint64 params[1];
+				params[0] = STR_TIMETABLE_CLEAR_SPEED_TOOLTIP;
+				GuiShowTooltips(this, STR_TIMETABLE_CLEAR_SPEED_TOOLTIP_EXTRA, 1, params, close_cond);
+				return true;
+			}
+			default:
+				return false;
+		}
+	}
+
 	void DrawWidget(const Rect &r, int widget) const override
 	{
 		const Vehicle *v = this->vehicle;