Snatched episodes in Schedule view (#3616)

* Schedule now shows newly snatched episodes (#3600)

* Fixed Snatched processing for image update on schedule.

* Updated snatched conditions to desired coding style.

* Simplified snatch check in schedule.mako

* Fixed jshint error.

* Cleaned up category titles on schedule template for poster + date sorting.

* Fix translations extraction

* I don't think that jQuery selectors return null if not found...

* Imports

* Fixed poster sorting not working

* Date sort on poster now sorts snatched episodes first to allow proper grouping before missed

* Sort using key (cmp is an old technique)

* Cleanup

* Fix calendar icon

* Fix key line height