code: function setUpLocale( context, next ) {
  	const language = getLanguage( context.params.lang );
  	if ( language ) {
  		context.lang = context.params.lang;
  		if ( language.rtl ) {
  			context.isRTL = true;
  		}
  	}
  
  	next();
  }
docs: Set up the locale if there is one