generated "link to a changeset" includes noise in notification email by default (BB-5011)

== current bug ==
=== link to a changeset generated ===
{{{
[[https://bitbucket.org/username/projectname/changeset/hash|hash]]
}}}
=== in email notification with bug ===
the URL includes the pipe "|" and the following string "hash"

== to fix ==
=== link to a changeset to be generated ===
{{{
[[https://bitbucket.org/username/projectname/changeset/hash | hash]]
}}}
with space beside (or at least before) the pipe

=== email notification to be ===
with correct, clickable link.

and more readable while editing, isn't it?