allow content in acknowledgement

template/classic/bp.typ

@@ -39,7 +39,6 @@
   if not is_none(keywords) {
     assert_dict_has(force_langs, keywords, "keywords");
   }
-  assert_not_none(acknowledgement_content, "acknowledgement content");
   if language == "cs" {
     assert_not_none(author_pronouns, "author gender");
   }

template/classic/dp.typ

@@ -38,7 +38,6 @@
   if not is_none(keywords) {
     assert_dict_has(force_langs, keywords, "keywords");
   }
-  assert_not_none(acknowledgement_content, "acknowledgement content");
   if language == "cs" {
     assert_not_none(author_pronouns, "author gender");
   }

template/template.typ

@@ -68,7 +68,7 @@
     abstract, "dictionary[string : string | content] | none", "abstract argument"
   );
   assert_type_signature(
-    acknowledgement, "dictionary[string : string] | none", "acknowledgement content"
+    acknowledgement, "dictionary[string : string | content] | none", "acknowledgement content"
   );
   assert_type_signature(author, "string | none", "author argument");
   assert_type_signature(author_pronouns, "string | none", "author gender argument");