[TASK] Update t3layout to 3.7.0

• [FEATURE] Add typoscript linter
• [FEATURE] Add case study list view
• [FEATURE] Add translated news"
• [BUGFIX] Adjust contact form
• [BUGFIX] Remove Old Accordion Element
• [BUGFIX] Remove Roadmap Template
• [BUGFIX] category link on news detail pages doesn't work
• [BUGFIX] Related News / Related Files look ugly
• [BUGFIX] Show full teaser in news list
• [BUGFIX] Resolve "Cookie banner hides feedback banner"
• [BUGFIX] Resolve "buttons on login page have wrong background (or wrong text color)"
• [TASK] Update to Jquery 3.4.0