Unsecure http link remain in learnosm article

[LaoshuBaby]

For example:

• https://github.com/hotosm/learnosm/blob/gh-pages/_posts/en/0500-10-15-remote-tracing_en.md

In not only one article there are links that still contain https link, I blamed it and found those links were added 7 years ago, in #635 some http link upgraded but looks like there are still a lot.

Maybe a automatically check should be conducted? And what about translation on Transifex?