[openstreetmap-website] Don't allow characters which aren't valid in XML 1.0. (#1139)

[OpenStreetMap Mirror]

Closed #1139 via 77c25dca8c9b60c2fd8dae6eeee1405ec24edf27.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1139#event-518882129
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