https://git.wikimedia.org/blob/wikimedia/bugzilla/modifications.git/HEAD/template/en/custom/list/table.html.tmpl only exists for bug 40244. Kill the file and create http://git.wikimedia.org/blob/wikimedia/bugzilla/modifications.git/HEAD/extensions/Wikimedia/template/en/default/hook/list/table-before_table.html.tmpl with the one-liner content:
[% abbrev.product.maxlength = 13 %]
See http://www.bugzilla.org/docs/4.4/en/html/api/Bugzilla/Extension.html for more information.
Advantage: When upgrading we don't need to sync the code in the file /template/en/custom/ anymore with code in the file /template/en/default.
Version: wmf-deployment
Severity: enhancement