xvimagesink: fix property description string

Spotted by Josep Torra.
encoding-profile: Fix typos and old API in docs

https://bugzilla.gnome.org/show_bug.cgi?id=733349
encoding-profile: Add example for using encoder presets with profiles

https://bugzilla.gnome.org/show_bug.cgi?id=733349
po: Update translations
appsrc: Fix memory leak with callback notify not being called in dispose

https://bugzilla.gnome.org/show_bug.cgi?id=733386
Update .po files
Release 1.4.0
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Miscellaneous reference leaks aimed for post 1.4