17720/17721 invalid project link in timelines table and cut off modal close icon

https://community.openproject.org/work_packages/17720
https://community.openproject.org/work_packages/17721
Is this just a question of ordering the CSS rules or are the rules in ```21_ajax_indicator.sass``` not applied?

If the later is true we should investigate.
Does it make sense to move code for legacy components into the "clean" area? Opinions @myabc?