Fix Formatter handling of unicode text in embedded attachments

[clrudolphi]

🤔 What's changed?

Improved the Formatters handling of text attachments when the text includes unicode characters.

⚡️ What's your motivation?

Properly handle/display reports.

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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[304NotModified]

Thanks! I think this really needs an unit test to prevent breaking it in the future (:

[gasparnagy]

Wow! Cool. You should have spent some time to find this issue. Thx for your efforts!