The OpenFoodFacts theme is in the off directory. The other directories are a copy of the default themes that come with Keycloak and are extracted here purely for reference.
To refresh the default Keycloak themes run make refresh_themes
Note that the messages in the theme/off/common/messages folder are refreshed automatically from the Open Food Facts language and country taxonomies and should not be manually edited.
Only the messages in the src/messages folder should be translated with Crowdin.
See the root README for details of specific templates that have been overridden that need to be checked when applying Keycloak updates.