Sync language.types entities

Author: Ayesh

language/types.xml

@@ -134,7 +134,7 @@ int(16)
  &language.types.void;
  &language.types.never;
  &language.types.relative-class-types;
- &language.types.value;
+ &language.types.singleton;
  &language.types.iterable;
  &language.types.declarations;
  &language.types.type-juggling;