WP User Manager - Multi-select field values are not translatable in String Translation

Overview of the issue

When using WP User Manager to add custom fields to profiles, you might experience the following issue: options from multi-select custom fields are not translatable in WPML’s String Translation.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

1. Fix the integration plugin (WPUM-WPML)

• Open the …/wp-content/plugins/wpum-wpml/includes/class-wpum-wpml-fields.php file.
• Look for line 20.
• Replace:

  add_action( 'update_wpum_field_meta', array( $this, 'update_meta_strings' ), 10, 4 );
          

• With:

  add_action( 'updated_wpum_field_meta', array( $this, 'update_meta_strings' ), 10, 4 );
          

• After that, go to Users > Custom fields, edit at least one of the multi-select field options, then navigate to WPML > String Translation to translate the values.

2. Fix the front-end output in WP User Manager

• Open the …/wp-content/plugins/wp-user-manager/includes/fields/types/class-wpum-field-multiselect.php file.
• Look for line .
• Replace the entire get_formatted_output() function with:

  	public function get_formatted_output( $field, $value ) {
  
  		$stored_field_options = $field->get_meta( 'dropdown_options' );
  		$stored_options       = array();
  		$stored_index         = array();
  
  		// Build lookup maps: value => label and value => original index
  		foreach ( $stored_field_options as $key => $stored_option ) {
  			$val = isset( $stored_option['value'] ) ? $stored_option['value'] : $key;
  			$lbl = isset( $stored_option['label'] ) ? $stored_option['label'] : '';
  			$stored_options[ $val ] = $lbl;
  			$stored_index[ $val ]   = $key;
  		}
  
  		$values = array();
  
  		foreach ( $value as $user_stored_value ) {
  			if ( ! isset( $stored_options[ $user_stored_value ] ) ) {
  				continue;
  			}
  
  			$label = $stored_options[ $user_stored_value ];
  
  			// Determine original index for this option so we can match textdomain package
  			$index = isset( $stored_index[ $user_stored_value ] ) ? $stored_index[ $user_stored_value ] : 0;
  
  			// Translation via WPML. 
  			$translated_label = apply_filters( 'wpml_translate_single_string', $label, 'wpum-fields-wpum-field-' . $field->get_ID(), 'wpum-field-dropdown_options_' . $index );
  
  			$values[] = $translated_label;
  		}
  
  		return implode( ', ', $values );
  
  	}