Test and fix autolayout for macOS GUI

We need to systematically test autolayout for all windows, and fix remaining issues.

Interesting parts to keep in mind:

Right to left language (there is a "simulation" option for that in xcode)
Language with long words (german?, there should be also a testing option)
Behaviour of packed dialogs (like simple preferences)
Test max height for simple preferences (it should still fit into 720p TV resolution)

Edited Dec 03, 2016 by David

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