code: function _setLangChangeListener( Widget, els ) {
      // call update for all widgets when language changes 
      if ( els.length > 0 ) {
          formHtml.addEventListener( events.ChangeLanguage().type, () => {
              new Collection( els ).update( Widget );
          } );
      }
  }
docs: Calls widget('update') when the language changes. This function is called upon initialization,
  and whenever a new repeat is created. In the latter case, since the widget('update') is called upon
  the elements of the repeat, there should be no duplicate eventhandlers.
  
  @param {{name: string}} widget The widget configuration object
  @param {<Element>}         els    Array of elements that the widget has been instantiated on.