Setting your ATLAS_REVISION to main is risky, though, because if strings have been removed from the upstream set of strings, they won’t be translated on your named release instance anymore.
ATLAS_REVISION (default: "main" for Tutor Main, or "{{ OPENEDX_COMMON_VERSION }}" if a named release is used)
if you’re using a named release branch, {{ OPENEDX_COMMON_VERSION }} will default to the specific tag you’re using (eg release/ulmo.1) so to get the most up-to-date ulmo strings you’re better off setting this to release/ulmo, not to main. This is discussed more here - [Bug][Documentation] Translation: "main" is not default, but "release/ulmo.1" - #5 by brian.smith - but I’d refrain from using main if you’re on a named release branch.