Last modified: 2011-03-13 18:05:27 UTC
The translation check tool just checks the LanguageXX.php file. It should probably check the database messages, too, if $wgUseDatabaseMessages is set, to see if any messages have been translated internally.
I'm pretty sure the purpose of the script is to check the translation _files_ specifically. It probably shouldn't even require having a wiki configured in the source tree.