Revert "add question mark to question"

This reverts commit 51bfdcd.

we don't want a question mark here, because the text serves 2 purposes:
- explain what the button does, as a standard title element (assertion)
- request confirmation after the button is pressed (question)

modules/mod/src/main/ui/ModUi.scala

@@ -32,7 +32,7 @@ final class ModUi(helpers: Helpers)(isChatPanic: () => Boolean):
       cls := (!allowed).option("disabled"),
       title := {
         if allowed
-        then "Definitely erase everything about this user?"
+        then "Definitely erase everything about this user"
         else "This user has some history, only admins can erase"
       },
       (!allowed).option(disabled)