51.0
====
* Don't duplicate locale keyboard layout [Yan; !4256]
* Fix activating network items in quick settings [Carlos; !4391]
* Improve lock/login screen styling [Marco; !4355]
* Cancel mount password dialogs when locking screen [Florian; !4393]
* Validate serilized image data before creating pixbuf [Florian; !4418]
* Fixed crash [Sebastian; !4401]
* Plugged leaks [Sebastian, Florian, Marco; !4385, !4383, !4381, !4203,
  !4397, !4398, !4422, !4426]
* Misc. bug fixes and cleanups [Florian, Marco, Sebastian, Carlos, Daniel;
  !4382, !4384, !4360, !4379, !4387, !4361, !4392, !4395, !4396, !4375, !4270,
  !4389, !4405, !4402, !4400, !4419, !4421, !4420, !4423]

Contributors:
  Marco "Capypara" Köpcke, Carlos Garnacho, Sebastian Keller, Florian Müllner,
  Daniel Nylander, Yan Pas, Marco Trevisan (Treviño)

Translators:
  Марко Костић [sr], Daniel Mustieles [es], Artur S0 [ru],
  Jor Teron [mjw], Balázs Úr [hu], Ask Hjorth Larsen [da], Hazel L [el],
  Bruce Cowan [en_GB], Roy-Magne Mo [nn]