Extensions: New on_episode_playback function
upload episode actions to gpodder.net in batches

allows partially successful uploads and resuming; avoids empty uploads
Merge pull request #62 from stefankoegl/batch-actions

Upload episode actions in batches
Mac OS X: GtkOSXApplication 2.0.1 fixes (bug 1759)
YouTube: Fix directory search (bug 1760)

For users who set their realname as display name,
search results resulted in non-working feeds.

Now using the username from the URI to fix this.
i18n tools: Prefer .po file from Transifex
Updated Czech (Czech Republic) translation
Updated Spanish translation
Updated Spanish (Spain) translation
Updated Spanish (Mexico) translation
Updated Basque translation
Updated Persian (Iran) translation
Updated Galician translation
Updated Hebrew translation
Updated Kazakh translation
Updated Norwegian Bokmål translation
Updated Dutch translation
Updated Portuguese translation
Updated Portuguese (Brazil) translation
Updated Swedish translation