Support multiple languages

[TheDuckCow]

As referenced here in Sprytile which uses the updater code, would be good to allow easy support for multiple languages. Blender artist thread on the topic here:

https://blenderartists.org/forum/showthread.php?384512-mini-Tutorial-Let-your-addon-support-multi-language-just-like-Blender-does

Curious to see or hear of other addons supporting multiple languages and if there is a consistent practice in place.

[carter2422]

This is something I've wanted to explore for RetopoFlow as well, particularly since it has a large Chinese user base (or so it seems from Twitter).

[TheDuckCow]

Perhaps leaping before taking a step, but it would be very cool and interesting if a tool were developer to convert any and all strings in a Python file into a language resource reference (similar to how it's typically done in mobile apps), but definitely want to do the research first to determine what's the best approach or method for filling out this information. Would be great to push forward a best practice when right now there doesn't seem to be much of one.

[TheDuckCow]

Minor bump on an this old question, @carter2422 has there been any new exploration for a standard approach to include internationalization (for reptopoflow or otherwise)? For this updater code, it would be key that it adds and not complicates the way addons implement i18n.