In order to solve the current chaos with incorrect strings (because of the automatic translation script), we created a new file just for mapping app strings with Moodle strings.
The moodle lang file would be the one in git://git.moodle.org/moodle-langpacks.git
This file is used by build_lang.sh script to create and update languages from the langpacks.
Work to do:
We should compare one by one all the strings and check if there's a better string. Then update the langindex.json file.