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

[pyrog]

> I decided against a catch-all to discourage misspelled keys. If other prefixes will get popular, one could add them easily in the future.
Ok, i didn't find your message before :wink: 

>So tags with the following keys are the only ones that get linked:
>
>* architect:wikidata
>* artist:wikidata
>* brand:wikidata
>* operator:wikidata
>* subject:wikidata

Not yet implemented, so i propose this expression : 
```
if key =~ /^(?:(architect|artist|brand|name|operator|subject):)?wikipedia$/
```


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