[openstreetmap/openstreetmap-website] prevent copycats during registration (#1419)

[d1g]

In addition to #1083 

suppress fiddling with unicode to impersonate legit osm users 

[recent case](http://www.openstreetmap.org/user/%D0%92%D0%BB%D0%B0%D0%B4%D0%B8%D0%BC%D0%B8%D1%80%20%D0%9A/diary/40318)


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