do not add language namespace for default language in Link component

Signed-off-by: Dmitriy Nevzorov <jimmy.lugat@gmail.com>

Author: jimmyn

src/Link.tsx

@@ -8,7 +8,7 @@ type Props = GatsbyLinkProps<any> & {language?: string};
 export const Link: React.FC<Props> = ({language, to, onClick, ...rest}) => {
   const context = useContext(I18nextContext);
   const urlLanguage = language || context.language;
-  const link = context.routed || language ? `/${urlLanguage}${to}` : `${to}`;
+  const link = urlLanguage !== context.defaultLanguage ? `/${urlLanguage}${to}` : `${to}`;
 
   return (
     // @ts-ignore