[openstreetmap-website] Better history diff by adding colorization of changes (#738)

[Alexander Heinlein]

I already searched for similar tickets but couldn't find any. And I agree that an actual implementation would be way more useful ;)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/738#issuecomment-42522000
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