Fix handling of related field; use date instead of year/month in examples; add swMATH definition
GitLab upgrade completed. Current version is 18.3.6
https://about.gitlab.com/releases/2025/07/17/gitlab-18-2-released/
https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/
Fix handling of related field; use date instead of year/month in examples; add swMATH definition