uld_use_admin_language;
	}

	/**
	 * @return string
	 */
	public function get_admin_language() {
		if ( $this->sitepress->is_wpml_switch_language_triggered() ) {
			return $this->sitepress->get_admin_language();
		}

		if ( ! $this->admin_language ) {
			$this->admin_language = $this->sitepress->get_admin_language();
		}

		return $this->admin_language;
	}

	/**
	 * @return bool
	 */
	private function is_admin_action_from_referer() {
		if ( $this->is_admin_action_from_referer === null ) {
			$this->is_admin_action_from_referer = $this->sitepress->check_if_admin_action_from_referer();
		}

		return $this->is_admin_action_from_referer;
	}

	public function wpml_language_has_switched() {
		// clear the current language cache
		$this->current_string_language_cache = array();
	}

	public function change_string_lang_ajax_callback() {
		if ( ! $this->verify_ajax_call( 'wpml_change_string_language_nonce' ) ) {
			die( 'verification failed' );
		}

		global $wpdb;
		$change_string_language_dialog = new WPML_Change_String_Language_Select( $wpdb, $this->sitepress );

		$string_ids = array_map( 'intval', $_POST['strings'] );
		$lang       = filter_var( isset( $_POST['language'] ) ? $_POST['language'] : '', FILTER_SANITIZE_SPECIAL_CHARS );
		$response   = $change_string_language_dialog->change_language_of_strings( $string_ids, (string) $lang );

		wp_send_json( $response );
	}

	public function change_string_lang_of_domain_ajax_callback() {
		if ( ! $this->verify_ajax_call( 'wpml_change_string_domain_language_nonce' ) ) {
			die( 'verification failed' );
		}

		global $wpdb, $sitepress;

		$change_string_language_domain_dialog = make( \WPML_Change_String_Domain_Language_Dialog::class );
		$response                             = $change_string_language_domain_dialog->change_language_of_strings(
			$_POST['domain'],
			isset( $_POST['langs'] ) ? $_POST['langs'] : array(),
			$_POST['language'],
			$_POST['use_default'] == 'true'
		);

		wp_send_json( $response );
	}

	private function verify_ajax_call( $ajax_action ) {
		return isset( $_POST['wpnonce'] ) && wp_verify_nonce( $_POST['wpnonce'], $ajax_action );
	}

}