Add label for advanced search link

core/ui/SideBarLists.tid

@@ -8,7 +8,7 @@ title: $:/core/ui/SideBarLists
 				<$link to="" class="btn-invisible">{{$:/core/images/close-button}}</$link>
 			</$linkcatcher>
 		</$reveal>
-		<$reveal state="$:/temp/search" type="match" text="">&nbsp;<$link to="$:/AdvancedSearch" class="btn-invisible">&hellip;</$link>
+		<$reveal state="$:/temp/search" type="match" text="">&nbsp;<$link to="$:/AdvancedSearch" tooltip={{$:/language/Buttons/AdvancedSearch/Hint}} aria-label={{$:/language/Buttons/AdvancedSearch/Caption}} class="btn-invisible">&hellip;</$link>
 		</$reveal>
 	</div>
 	<$reveal state="$:/temp/search" type="nomatch" text="">