pitivi.desktop fixes and more
@michael.terry
Submitted by b'Michael Terry' Assigned to Brandon Lewis @brandon_lewis
Description
I set about to update pitivi.desktop and got a little carried away. Possibly these several issues should be in different patches, but they're all small fixes.
1: Updated the Categories line. I removed the deprecated Application, added AudioVideoEditor, and got rid of the distro-specific entries, figuring that was best done by the packagers (and since it seemed like that part of the file hadn't been looked over in a long time).
2: Made the Name and Comment lines translatable. This requires an extra level of indirection for the desktop file, so desktop.in becomes desktop.in.in. Also, after adding the lines to Makefile.am to support this, autogen.sh started giving errors until I did a fresh intltoolize from my 0.37.1 version. I also changed the text of the Comment line. Modify as you see fit, but the HIG does recommend the "Do X" format.
3: Made the Icon line not include the ".png". Along with this change, I set up pitivi to install its application icon in the right place so that it is themeable and future icons of differing sizes are easier to install. This also required modifying the source to use icon theme calls for the app icon.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=520653