Support yaml extension

[sdavids]

trafficstars

Is your feature request related to a problem? Please describe.

We are not in the 90ies anymore.

Describe the solution you'd like

In addition to *.glossary.yml *.glossary.yaml is supported

Describe alternatives you've considered —

Additional context

https://www.heatware.net/devops-cloud/yml-vs-yaml/ https://techkluster.com/docker/yaml-vs-yml/