[openstreetmap-website] Update browse_helper.rb (#814)

[pyrog]

see this regexp to match all cases : http://regexr.com/39o1g
```
^(?:(architect|artist|brand|name|operator|subject):)?wikipedia(?:(?::)(\S*))?$
```
and
```
^(?:(architect|artist|brand|name|operator|subject):)?wikidata$
```


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https://github.com/openstreetmap/openstreetmap-website/pull/814#issuecomment-59240177
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