Bail out straight away if the tag value is a URL rather than waiting
until we have parsed the key as we may change the value in the process
of parsing the key.
The semantics are as documented on
http://wiki.openstreetmap.org/wiki/Key:wikipedia, i.e.:
# English Wikipedia article Foobar
wikipedia=Foobar
# German Wikipedia article Foobar
wikipedia:de=Foobar
wikipedia=de:Foobar
If someone gives a http:// link we just pass it through.
feature use the name key corresponding to the user's
locale. E.g. "name:is" for Icelandic.
This will fall back on "name". The interface will be equivalent unless
the user has selected another language than English in the preferences
and objects with localized name:* tags corresponding to the user's
language are being displayed.
output. Makes e.g. "#{name}, v#{object.version.to_s}" which is used in
the changeset browser translatable.
I'm still not happy with how the anchor is constructed. we're linking
from /browse/changeset/1234 to e.g. node "[[366672999, v1]]" even
though the page we're linking to might take us to that node at version
2. The link should be "[[366672999]], v1" instead.
But that's something to solve later.
