General improvements on the styling

• Removed dash styling for list items
• Fixed the modal on IE11
• Added overflow ellipsis when the text of a button is too long in the intro
• Re-added the animation for multiline links in text
• Added wysiwyg possibilities to the team component
• Added a button to the intro as cta to sell tickets
• Added masonry to the paintings grid
• Removed bug on language component
• Added a read more button to the article detail after section 3 within the article
• Added active state of the main navigation
• Crossbrowser check
• More spacing in the intro section