Nils Reuvers contributed to plone/cookieplone-templates and plone/training by implementing foundational multilingual support and template configuration, enhancing localization readiness and developer productivity. He addressed configuration correctness by refining backend manifests and removing incorrect frontend multilingual handling, using JavaScript and YAML to ensure stable, maintainable code. Nils improved packaging hygiene by excluding backend configuration files from distribution and adjusted pre-commit i18n checks to streamline quality control. In plone/training, he updated documentation to clarify content rule moderation workflows and performed targeted grammar corrections in Markdown, demonstrating disciplined version control and technical writing. His work emphasized stability, clarity, and workflow efficiency across repositories.