Updated mediawiki/extensions
Project: mediawiki/extensions/PGFTikZ  c5df6abe037cf20198e69ebd70a1901b376e61c6

Consistency tweaks

* Use single quotes in i18n file
* Image -> File
* Add FIXME for message documentation
* Fix extension type

Change-Id: I0ed44a981862df277f7396fbc79b45bbf59b156b