Ultimate Member: Change view field value based on the current language via WPML plugin

functions.php

function um_custom_field_view_wpml( $res, $data, $type ) {
	if ( UM()->external_integrations()->is_wpml_active() ) {

		global $sitepress;
		$language_code = $sitepress->get_current_language();

		if ( $language_code == 'zh-hant' ) {
			switch ( $data['metakey'] ) {
				case 'gender':
					$res = $res == 'Female' ? '女' : '男';
					break;
			}
		} elseif ( $language_code == 'zh-hans' ) {
			switch ( $data['metakey'] ) {
				case 'gender':
					$res = $res == 'Female' ? '女': '男';
					break;
			}
		}
	}

	return $res;
}

add_filter( 'um_view_field', 'um_custom_field_view_wpml', 10, 3 );