Add the title prefixes based on tracker names also to the sf2ghJSON.py
script. If the tracker has a non-standard name, no prefix is added (same
behavior as before). If it has a standard name, the same prefixes as in
issues.py are used.
As suggested on mwclient/mwclient#1 (comment)
This formats the metadata strings as italics,
and separates them from the text with a horizontal rule.
The language was also slightly reworded for increased clarity.
The result is similar to this (manually formatted) example: