TBTR: Fix tooltips for start/stop replacement buttons

src/lang/extra/english.txt

@@ -1892,7 +1892,9 @@ STR_TMPL_REFIT                                                  :{BLACK}Refit
 STR_TMPL_GROUP_INFO                                             :{BLACK}Group Info: {ORANGE}
 STR_TMPL_TEMPLATE_INFO                                          :{BLACK}Template Info: {ORANGE}
 STR_TMPL_RPL_START                                              :{BLACK}Start replacing
+STR_TMPL_RPL_START_TOOLTIP                                      :{BLACK}Press to start replacement of trains in the selected group with the selected template
 STR_TMPL_RPL_STOP                                               :{BLACK}Stop replacing
+STR_TMPL_RPL_STOP_TOOLTIP                                       :{BLACK}Press to stop replacement of trains in the selected group
 STR_TMPL_TEMPLATE_OVR_VALUE                                     :{BLACK}Buying Cost: {GOLD}{CURRENCY_LONG}
 STR_TMPL_TEMPLATE_OVR_VALUE_LTBLUE                              :{BLACK}Buying Cost: {LTBLUE}{CURRENCY_LONG}
 STR_TMPL_TEMPLATE_OVR_RUNNING_COST                              :{BLACK}Estimated Running Cost: {LTBLUE}{CURRENCY_LONG}

src/tbtr_template_gui_main.cpp

@@ -171,11 +171,11 @@ static const NWidgetPart _widgets[] = {
 	EndContainer(),
 	// Start/Stop buttons
 	NWidget(NWID_HORIZONTAL),
-		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, TRW_WIDGET_START), SetMinimalSize(150, 12), SetDataTip(STR_TMPL_RPL_START, STR_REPLACE_ENGINE_WAGON_SELECT_HELP),
+		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, TRW_WIDGET_START), SetMinimalSize(150, 12), SetDataTip(STR_TMPL_RPL_START, STR_TMPL_RPL_START_TOOLTIP),
 		NWidget(WWT_PANEL, COLOUR_GREY, TRW_WIDGET_TRAIN_FLUFF_LEFT), SetMinimalSize(15, 12), EndContainer(),
 		NWidget(WWT_DROPDOWN, COLOUR_GREY, TRW_WIDGET_TRAIN_RAILTYPE_DROPDOWN), SetMinimalSize(150, 12), SetDataTip(0x0, STR_REPLACE_HELP_RAILTYPE), SetResize(1, 0),
 		NWidget(WWT_PANEL, COLOUR_GREY, TRW_WIDGET_TRAIN_FLUFF_RIGHT), SetMinimalSize(16, 12), EndContainer(),
-		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, TRW_WIDGET_STOP), SetMinimalSize(150, 12), SetDataTip(STR_TMPL_RPL_STOP, STR_REPLACE_REMOVE_WAGON_HELP),
+		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, TRW_WIDGET_STOP), SetMinimalSize(150, 12), SetDataTip(STR_TMPL_RPL_STOP, STR_TMPL_RPL_STOP_TOOLTIP),
 		NWidget(WWT_RESIZEBOX, COLOUR_GREY),
 	EndContainer(),
 };