Translation branches use subdirectories and can thus not be built automatically with the default settings. (You can work around this by listing all DC files including subdirs in .travis-check-docs.)
This has been fixed as part of the move to GitHub Actions: We use find . -name 'DC-*' to find all DC files within a repo rather than relying on the old DC-* glob.
Translation branches use subdirectories and can thus not be built automatically with the default settings. (You can work around this by listing all DC files including subdirs in .travis-check-docs.)
(report via @tbazant)