function testimonialCarouselBerlin (widgetId, animationSpeed = 1000) {
  $(`.widget-${widgetId} .testimonial-grid`).flexslider({
    animation: 'slide',
    slideshow: false,
    animationSpeed: animationSpeed
  })

  $(`.widget-${widgetId} .prev-testimonial`).on('click', function () {
    $(`.widget-${widgetId} .flex-prev`).trigger('click')
  })

  $(`.widget-${widgetId} .next-testimonial`).on('click', function () {
    $(`.widget-${widgetId} .flex-next`).trigger('click')
  })
};