date is shown incomplete using German localization

[florianbieser]

Language

German (de-DE)

What's the issue?

In German-speaking countries, a date like "2020-08-14" (the 14th of August 2020) is often written as "14. August 2020" (this is the localization of :date_long for de-DE). Due to the fact that the date in the article header, which shows the article date, is processed using the "markdownify" function, the date is interpreted as an ordered list starting at the Day (In the example, "14"):

<time datetime="2020-08-14 00:00:00 +0000 UTC">
  <ol start="14">
    <li>August 2020</li>
  </ol>
</time>

Since the ordered list has the style setting "list-style: none;", the Day (14) is not displayed at all.

This issue can be observed (as example) on the following pages:
https://jpanther.github.io/congo/de/samples/icons/
https://jpanther.github.io/congo/de/samples/

Theme version

v2.11.0

Hugo version

v0.124.1

Relevant Hugo log output