* testCompression.php: Called $wgLang, but didn't set it.
It just assumed it was English. Use a local variable instead.
* update.php: Set $wgLang to English. Set main RequestContext as well.
* transstat.php: Rename $wgLanguages to $languages for less confusion.
It's just a local instance of language.inc's Languages class.
Change-Id: I67865f4d8710946001f7586ab0a17e125366b184