Software catalog section improvements

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On the new Software Catalog er..."Catalogue" page, how does
one edit an existing entry? There is no contact email to
do so. While I know I can just bug Dave on this list, the
public should be told an email address.

I messed up entering "Spree", it should be under Applications
and has an open source, not a commercial license.

Also, it might be nice if the "Procedural Languages" section
mentioned that the builtin languages that are already available,
lest people stumble across this page and not be aware that
C, plpgsql, perl, python, and tcl are all available in core.

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