[docs] Fix some issue with i18n

[hhshii]

• I have followed (at least) the PR section of the contributing guide.

Closes #13367

[mbrookes]

Thanks for the contribution. We normally manage translations here, and I have found, and hopefully fixed, the errant 'code' translation.

However the wrapping in <p> tags is slightly concerning. That doesn't show up in CrowdIn, so your PR may be the only way to fix it. We have github sync disabled at the moment while waiting for a bug fix from CrowdIn, so I'm putting the PR on hold until that's fixed.

[oliviertassinari]

Some changes:

• I did a second pass on the <code> issue. I have replaced it with a backtick `.
• The list issue is well summarized in https://talk.commonmark.org/t/blank-lines-before-lists-revisited/1990. I have change the syntax to make crowding happy. It's most likely an issue with their engine.
• The ?lang=X query parameter should be working now.

[oliviertassinari]

@GFwer Thank you for reporting these issues!