Jenkins bundles an ancient release of Prototype.js (1.7 in war from 2010, 126.96.36.199 in Stapler from 2008). These releases are not compatible with all features of modern JS frameworks like jQuery and Chart.js and Bootstrap. In order to use other libraries we should upgrade to the latest release 1.7.3 (still old - 2015 - but with several fixes).
E.g., with the bundles 1.7 version the simple 'Hello World' is not shown due to a JS error. With version 1.7.3 the error disappears.