Add dubbed video mapping file into language packs

Dependent on #1285; find diff here: https://github.com/bcipolli/ka-lite/compare/i18n_cleanup_2...1164?expand=1

Simple stuff: add dubbed video mapping into language packs, unzip and put into the proper location.  Also add to the `update` and `zip_kalite` commands, so that all installations will have the mapping file.  That way, if people download / copy in dubbed videos themselves, they'll be instantly recognized properly.

Testing:
* Tested this well on the central server side.  Not 100% sure the distributed server side is implemented!