3.28.0
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* Modernise JS usage in platform overview and demos, #791111 (Florian Müllner)
* Update spell-checking page in platform overview, #781265 (Sébastien Wilmet)
* Glade updates in platform overview (Andre Klapper)
* Updated translations:
  cs      (Marek Černocký)
  de      (Christian Kirbach, Mario Blättermann)
  es      (Daniel Mustieles)
  pt_BR   (Rafael Fontenelle)
  sv      (Anders Jonsson)