Unfortunatelly I need to see the site to tell anythig. Language may not be configured properly or a wrong language version was installed. Can You please move the site to a live server for me to make tests ?
I would check if langage switcher module has languages applied. Than I would check if forcing language in url "?lang=en" will work. Can You put this on a subfolder and set offline? Than send me an access to it, so I'll can check. I will also need an access to joomla panel to see language configuration and rest of the important settings.
Any module should show it, but if multilanguage is configured wrong way than no selection will be shown, just an empty list. Please follow this instruction to be sure it's set properly: http://www.gavick.com/documentation/gen ... oomla-1-7/