add maintain aspect ratio option on image resizing
change cancel button's text to 'Close' after conversion is over
mark two unmarked strings for translation
bugfix: really use avconv when it is prefered
Removed reference to 'ffmulticonverter/tabs.py' since it's no longer available
String describing conversion format marked for translation
Updated locale files and project resources
Merge pull request #21 from angularcircle/master

String marked for translation; updated locale and resources
add translator's name
Merge pull request #4 from Ilias95/master

Keep up with upstream.