Fix encoding of UTF-8 domain names

[timobrembeck]

Short description

This is a bit ugly workaround, but I doubt that the underlying problem will be fixed in lxml or libxml2 anytime soon.

Proposed changes

• Use unicode in lxml's tostring() method
• Fix urlencoded domain names
• No longer encode html entities in TinyMCE

Side effects

• The page content now contains utf-8 characters instead of html entities, but I think most modern browsers should be able to display them without problems.

Resolved issues

Fixes: #2274

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Code Climate has analyzed commit 01fef50 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 78.9% (50% is the threshold).

This pull request will bring the total coverage in the repository to 81.8% (-0.2% change).

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[david-venhoff]

Thanks, looks good to me!
I am a little bit worried that the regex can find some false positives, but even if it happens it should be fine since it just removes the encoding of unicode characters.

[MizukiTemma]

🎉 Cool!!!!!! 🎉