* Improved links for the platform overview (Alexandre Franke)
* Clarifications and improvements to the programming guidelines (Philip
Withnall, Sébastien Wilmet)
* Typo and small fixes for the optimization guide and HIG (Anders Jonsson)
* Use CC-BY-SA 4.0 for the platform overview (Ekaterina Gerasimova)
* Updated translations:
cs (Marek Černocký)
de (Mario Blättermann, Christian Kirbach)
el (Tom Tryfonidis, Γιάννης Κουτσούκος)
es (Daniel Mustieles, Javier Mazorra)
ko (Seong-ho Cho)
sv (Anders Jonsson)
