Updated French translation

Thanks to Mickael Albertus and Alain Lojewski.
renderingdialog.ui: Mark the Render button's label as translatable

This makes its translations actually show up
Updated Galician translations
Updated Galician translations
bin: Make sure the PyGobject path is always first in PYTHONPATH

Otherwize we get issue when importing it has it picks the wrong
__init__.py file for overrides
bin: Build gst-devtools only if in developer mode
Finnish translation update
Updated Traditional Chinese translation(Hong Kong and Taiwan)
project: Always set auto-transition to true on newly created timelines
Updated Serbian translation
Updated Latvian translation
render: Take into account video size scaling value when rendering

https://bugzilla.gnome.org/show_bug.cgi?id=709473
project: Avoid to work with read only caps

https://bugzilla.gnome.org/show_bug.cgi?id=709473
mainwindow: Make it possible to save project when an asset moved
bin: Fix GI_TYPELIB_PATH mistakes
previewers: stop generation when cleaning up
elements/keyframes: add up inpoint in some places.