code: protected void deleteAlias(MonolingualTextValue alias) {
          String lang = alias.getLanguageCode();
          AliasesWithUpdate currentAliases = newAliases.get(lang);
          if (currentAliases != null) {
              currentAliases.aliases.remove(alias);
              currentAliases.deleted.add(alias);
              currentAliases.write = true;
          }
      }
docs: Deletes an individual alias
  
  @param alias
  the alias to delete