gui, man, authors: Update docs, translations, and contributors
gui, man, authors: Update docs, translations, and contributors

wweich/syncthing,wweich/syncthing,wweich/syncthing,imsodin/syncthing,imsodin/syncthing,imsodin/syncthing,syncthing/syncthing,wweich/syncthing,syncthing/syncthing,syncthing/syncthing,imsodin/syncthing,syncthing/syncthing,syncthing/syncthing,syncthing/syncthing,imsodin/syncthing