Remove update_locale check

wagtail/core/actions/create_alias.py

@@ -82,10 +82,6 @@ class CreatePageAliasAction:
             raise CreatePageAliasIntegrityError(
                 "You cannot copy a tree branch recursively into itself"
             )
-        if not parent.is_root() and self.update_locale is not None:
-            raise CreatePageAliasIntegrityError(
-                "You cannot manually set locale of a page that's not at the root of the tree."
-            )
 
         if (
             self.user