prod: Add screenshots related to appdata.xml

Related to:
- https://github.com/metabrainz/picard/pull/1020
- https://codein.withgoogle.com/dashboard/task-instances/5811336429699072/

v2.0.1.6: PW-18: Review the various tag listings (#100)

* Add documentation for originalartist and originalalbum

* Add documentation for originalyear

* Add documentation for a bunch of tags

* Add documentations

* Fix spelling

* fixing indentation

v2.0.1.5: Merge pull request #90 from mineo/test-fixes-no-more-master

download_plugins: Use URLs for 1.0 if version is None