Issue #2331907 by LewisNyman, alvar0hurtad0, tim-diels, tstoeckler, jOksanen, lduerig, psebborn, Outi: Seven theme's uppercasing of details summaries fails on the Simpletest results form

Issue #2408491 by joaogarin, mrjmd, vermario, jOksanen: Rewrite button components inline with our CSS standards

Issue #2346931 by G-raph, LewisNyman, zaporylie, jOksanen, webmorozov: Fixed Dropbutton AJAX throbber looks awful.