This was the Translation framework used by RxLab.
We've now moved to using gettext and po files for all our tools, written either in Adobe ExtendScript, Qt/C++ or Python.
To help using this framework with Adobe applications, we've forked gettext.js to create gettext.jsxinc
If you're interested to contribute to the translation of the Rx Open Tools, join us on crowdin at translate.rxlab.io, where we're working together on the localization.