Updated Brazilian Portuguese translation
Updated Polish translation
Updated Czech translation
project: Flush the pipeline when we set restriction caps

This way we make sure that the viewer updates
Updated Lithuanian translation
project: Emit "rendering-settings-changed" when the pixel aspect ratio changes

Otherwise aspect ratio changes would not always get applied.

Fixes bug #721973
mainwindow: Actually use DAR (not PAR) to set the viewer's display aspect ratio

Using the pixel aspect ratio to set the viewer's (display) aspect ratio
made no sense. We had a nice unused method for that exact purpose.

This also happens to fix bug #722003
clipmediaprops: Use proper names for checkbutton widgets
clipmediaprops: Prevent setting an invalid framerate from a misdetected clip

Fixes bug #721888
Add a comment for translators to clarify "Pixel aspect ratio"

Also update the French translation
project: Default to a square pixel aspect ratio

This would be a saner default
Updated Polish translation
Updated Brazilian Portuguese translation
dogtail: Remove testing of missing font chooser element
timeline: Remove previous/next keyframe menu items

The logic is missing and we are not sure how useful they are.
The unittests when the functionality has been added are long gone:
efa26eb0
timeline: Clarify a fixme
timeline: Cleanup the logic which allocates a ghostclip to a layer
timeline: Fix dragging an asset to the ruler

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1061824
Use the soft dependencies objects from the check module
project: Avoid emitting done-importing when a title asset is added

When creating a new project and clicking Title > Create-and-insert,
the project emits done-importing which should be signalled only when
importing external files.