Renderer dialog:

Renderer dialog:
* Default name for videos is now translatable (instead of being untitled everywhere)
* If manually directory entered like /tmp/a/, path is extended with default filename instead of like /tmp/a/.avi
* Extension won't be changed to lowercase (e.g. if file with uppercase extension already exists) after selecting it and then selecting a different format (but with same file extension)
* Fixed renderer crashing when target directory doesn't exist <http://www.kdenlive.org/mantis/view.php?id=1051>

svn path=/trunk/kdenlive/; revision=3757