make i18n_extract
make i18n_merge
Flow is as follows: <add some new i18n.Message in code> make i18n_extract <fill the generated translations/translate.*.toml> make i18n_merge <perhaps delete translations/translate.*.toml> ?
Supports rfc4646 language tags in env vars. If region is detected (en-US, fr-CA), will try to load regional files first.