Made a change in the responsive.js in the Zircon theme.
There is a selector chain that to widly works for images changing there heigth. Ensured by using a :not pseudo class, that the images from the news-block on the front page don't get affected as well as the organisations block.
Old selector: #slideshow-wrapper .view .views-field img, #slideshow-wrapper .view .views_slideshow_cycle_main, #slideshow-wrapper .views-slideshow-cycle-main-frame-row, #slideshow-wrapper .views-slideshow-cycle-main-frame'
New selector : #slideshow-wrapper .view:not(.view-view-active-news):not(view-list-all-rso) .views-field img, #slideshow-wrapper .view .views_slideshow_cycle_main, #slideshow-wrapper .views-slideshow-cycle-main-frame-row, #slideshow-wrapper .views-slideshow-cycle-main-frame'
Deleted all tables where the name started with content_field, content_type or d6_og. These tables are leftovers from Drupal 6 and no longer used.
