Improve coloring of logged commands

[ssbarnea]

Fixes: #2356

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• wrote descriptive pull request text
• added/updated test(s)
• updated/extended the documentation
• added relevant issue keyword
  in message body
• added news fragment in changelog folder
  • fragment name: <issue number>.<type>.rst for example (588.bugfix.rst)
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  • "sign" fragment with -- by :user:`<your username>`.
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    Fixed an issue with non-ascii contents in doctest text files -- by :user:`superuser`.

  • also see examples
• added yourself to CONTRIBUTORS (preserving alphabetical order)

[gaborbernat]

Test please 🙏

[ssbarnea]

Test please 🙏

Done!