Automatically fetch current language meta value for user fields with ACF

load_translated_value_if_exists.php

/*
 * Modify ACF fields to account for translations if available
 *
 * This solution requires the use of Polylang for WP translations.
 * Use this by duplicating the field groups for user meta and append _languageslug to each field in the duplicated group.
 * So for a site with a swedish translation an example field would be named "user_phonenumber" 
 * in english (default) and in the swedish translation group "user_phonenumber_sv"
 */
function load_translated_value_if_exists( $value, $post_id, $field ){

	//dont modify admin
	if( is_admin() || !function_exists('pll_current_language') )
		return $value;

	//Current language slug from polylang
	$current_lang = pll_current_language('slug');

	$translated_value = false;
	if ( strpos($post_id, 'user') !== false ) {
		//User meta
		$user_id = explode('_', $post_id)[1];

		if( strpos($field['parent'], 'field') !== false ){
			//this is a subfield so we need to modify the parent field section of it's name too.
			preg_match('/_\d+_/', $field['name'], $match);
			//rebuild it
			$components = explode($match[0], $field['name']);
			$fieldname = $components[0] . '_' . $current_lang . $match[0] . $components[1] . '_' . $current_lang;

		}else{
			$fieldname = $field['name'] . '_' . $current_lang;
		}

		$translated_value = get_user_meta($user_id, $fieldname, true);
	}

	if( $translated_value )
		return $translated_value;

	return $value;
}
add_filter('acf/load_value', 'load_translated_value_if_exists', 10, 3);