Handle optval when translating names.

src/parser/affiliated_keyword.rs

@@ -103,12 +103,16 @@ pub(crate) fn parse_affiliated_keywords<'g, 's>(
 }
 
 fn translate_name<'g, 's>(global_settings: &'g GlobalSettings<'g, 's>, name: &'s str) -> String {
+    let name_until_optval = name
+        .split_once("[")
+        .map(|(before, _after)| before)
+        .unwrap_or(name);
     for (src, dst) in global_settings.element_keyword_translation_alist {
-        if name.eq_ignore_ascii_case(src) {
+        if name_until_optval.eq_ignore_ascii_case(src) {
             return dst.to_lowercase();
         }
     }
-    name.to_lowercase()
+    name_until_optval.to_lowercase()
 }
 
 fn is_single_string_keyword<'g, 's>(