Last modified: 2014-10-26 17:46:50 UTC
On https://commons.wikimedia.org/wiki/Special:MediaStatistics?uselang=en it is shown that Commons has 0 files of the type ".rg", and they are classified as "". Like on https://translatewiki.net/wiki/Special:MediaStatistics?uselang=en I would expect the type to be classified as "Unknown", but because it's "", the type description is fetch from [[MediaWiki:mediastatistics-header-]], which obviously doesn't exist.
I think its because commons has an entry in image table with all fields null.