yoastseo-dep/src/languageProcessing/helpers/language/getLanguage.js

Yoast clientside page analysis

/**
 * The function getting the language part of the locale.
 *
 * @param {string} locale The locale.
 * @returns {string} The language part of the locale.
 */
export default function( locale ) {
	return locale.split( "_" )[ 0 ];
}