Updated mediawiki/extensions
Project: mediawiki/extensions/GWToolset  b03f2e9a32b508cfdd5364be7f191fd2acee04cf

Improve category instructions

Received some feedback that the placeholder, Painted by, in the
item specific categories section was misleading because it was
being translated.

* marked that placeholder as {{notranslate}}
* added additional instructions and a link to the category names
  documentaion on commons

Change-Id: I2a9bb5c5d0ff3325f33be67afe7c755e4330269e