Why if you used the exact same string that is recommended to be used (see http://wiki.playonlinux.com/index.php/Scripting_-_Chapter_10:_Script_Translation) the script throw a warning about ?
Checking bad gettext messages
* Please select the setup file to run.
* Please wait while $TITLE is installed.
[ Warning ]
I think this must be the other way, if you use them, it's ok. If you use something similar but not equal, warn about it.