UI: web module UI broken if visiting link from Plinth

UI is broken when opening web app links from Plinth (in the same window). Those links are mostly in app descriptions (roundcube, tt-rss etc). Tested with Firefox and Chrome, my client and server are both Debian Buster. For example I get same Cockpit view as in #1577 (closed) .

Adding data-turbolinks="false" to the link element should fix the problem.