Ultimate Member - Profile Completeness: Change field label based on the current language via WPML plugin

functions.php

function my_custom_fields_array_for_titles( $fields, $key ) {

	if ( UM()->external_integrations()->is_wpml_active() ) {
		global $sitepress;
		$language_code = $sitepress->get_current_language();

		if ( $language_code == 'zh-hant' ) {
			switch ( $key ) {
				case 'coach-mentoring_specialties':
					$fields[ $key ]['label'] = '導師(Coach-Mentoring)特長';
					break;
				case 'counseling_specialties':
					$fields[ $key ]['label'] = '輔導(Counseling)特長';
					break;
				case 'about_me':
					$fields[ $key ]['label'] = '關於我';
					break;
				case 'user_profile':
					$fields[ $key ]['label'] = '我的個人簡介檔案';
					break;
			}
		} elseif ( $language_code == 'zh-hans' ) {
			switch ( $key ) {
				case 'coach-mentoring_specialties':
					$fields[ $key ]['label'] = '导师(Coach-Mentoring)特长';
					break;
				case 'counseling_specialties':
					$fields[ $key ]['label'] = '辅导(Counseling)特长';
					break;
				case 'about_me':
					$fields[ $key ]['label'] = '关于我';
					break;
				case 'user_profile':
					$fields[ $key ]['label'] = '我的个人简介档案';
					break;
			}
		}
	}

	return $fields;
}
add_filter( 'um_profile_completeness_fields_array_for_titles', 'my_custom_fields_array_for_titles', 10, 2 );