code: protected function qualifyColumns($columns)
      {
          foreach($columns as &$column) {
              if(!in_array($column, $this->model->translatableAttributes())) {
                  continue;
              }
  
              $primary = $this->qualifyTranslationColumn($column);
              $fallback = $this->qualifyTranslationColumn($column, true);
  
              if($this->model->shouldFallback()) {
                  $column = new Expression($this->compileIfNull($primary, $fallback, $column));
              } else {
                  $column = $primary;
              }
          }
  
          return $columns;
      }
docs: Qualify translated columns
  
  @param $columns
  @return mixed