fix: Icons: Force languageicon sizes

(integrated from master branch change 03d93f3 by Nathan Rijksen <n.rijksen@gmail.com>)
Prefs: Make OK the default button, not apply

(integrated from master branch change 296a4eb by Nathan Rijksen <n.rijksen@gmail.com>)
Logging: Implement loggin.setGlobalLevel

(integrated from master branch change fe182a8 by Nathan Rijksen <n.rijksen@gmail.com>)
fix: Breadcrumbs: wrong size on HiDPI displays

(integrated from master branch change cffdb89 by Nathan Rijksen <n.rijksen@gmail.com>)
Notify: Add "dev" category

(integrated from master branch change 3804a88 by Nathan Rijksen <n.rijksen@gmail.com>)