Add script to generate source-only repos for Thunderbird and Seamonkey (#2656)
Add script to generate source-only repos for Thunderbird and Seamonkey (#2656)

This script uses https://hg.mozilla.org/projects/comm-l10n/ repository to create repositories with source strings only for Thunderbird and Seamonkey.

It's a standalone script, rather than being included in mozilla-en-US.py, because the latter will be obsolete and removed soon.

Co-authored-by: Francesco Lodolo <cc6716931f743a0facde5c251c3dd9387a635faa@mozilla.com>
mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon,mathjazz/pontoon,mathjazz/pontoon,mathjazz/pontoon