three new aspects: podcast. - episode, and - season)

[egonw]

See https://github.com/WDscholia/scholia/issues/2414

Description

Implements aspects for podcasts.

Caveats

The current PR has reasonable stubs, but particularly the podcast episode aspect is a bit boring right now.

• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update
  • [x] I have made corresponding changes to the documentation
• [ ] This change requires new dependencies (please list)

Codacy Warning

The current PR causes a Codacy warning for a line of code where a random call is made for the "Random podcast" button, following the approach of other random buttons:

I assume this risk is acceptable. I cannot think of an attack using this approach, e.g. allowing people to also end up on an advertisement item in Wikidata. Nor worse.

If you make changes to the Python code

• [x] My code passes the tox check, I can receive warnings about tests, documentation or both

Testing

The podcast index page has a number of examples: http://127.0.0.1:8100/podcast/ (see below screenshot)

Checklist

• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [x] I have not used code from external sources without attribution
• [ ] I have considered accessibility in my implementation
• [ ] There are no remaining debug statements (print, console.log, ...)

[egonw]

Some initial screenshots. First, for a podcast:

The index page:

An episode:

[egonw]

Screenshot of the new language feature:

[egonw]

Okay, that should do it. I declare this version "feature complete" for a launch. @fnielsen, @Daniel-Mietchen, your review is most welcome.