videobox: Don't overwrite the first component with the alpha value for BGRx

Instead leave the x component unset when filling the borders.

https://bugzilla.gnome.org/show_bug.cgi?id=733380
po: Update translations
Update .po files
Release 1.4.0
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tests/souphttpsrc: Skip consistently failing test

The test in question tries to connect to Virgin Radio Ogg stream at
smgradio.com, but this server is no longer operational.