Refresh dubbed video mappings before zipping, and within git-based update
Clean up paths & structure across files, to share more, assume less.
this file is a local-only file.
Remove subtitle map from repo.
Make dubbed video map have a graceful fallback.
Add latest dubbed video map to all language packs.
Merge branch 'paths_sharing' into 1222

Conflicts:
	kalite/i18n/management/commands/update_language_packs.py
Merge branch 'develop' of github.com:learningequality/ka-lite into 1222

Conflicts:
	kalite/management/commands/zip_kalite.py
Refactor metadata grabbing, incorporate dubbed videos and exercises into language packs.
Merge branch 'i18n_cleanup_2' into 1164

Conflicts:
	kalite/i18n/management/commands/generate_subtitle_map.py
	kalite/i18n/management/commands/update_language_packs.py
	kalite/management/commands/zip_kalite.py
Moving dubbed video files to the proper location on the distributed server, after language pack download
Merge branch '1164' of github.com:bcipolli/ka-lite into 1222

Conflicts:
	kalite/i18n/management/commands/update_language_packs.py
	kalite/shared/i18n.py
Distributed server side of 1222--move exercises if they exist.
Merge branch 'develop' of github.com:learningequality/ka-lite into 1222
TWO pdbs... record\! :$
Showing # exercises available in language pack, fixing overwrite bug
Add option to skip all updates & inclusion of KA data, put debug output via logging instead of print.
Remove duplicate code for language selection.
Only scrap exercises for languages that we know exercises exist for.
Add missing files, for topic title translations.