If you want to change all the references (not just the tab names) you'll need to edit the language files. I find the easy and upgrade-friendly way to do this is to create a new en_us.lang.override.php file in each module's language directory (and probably for the application's language file too). In that file you can just define alternate translations for each of the fields in en_us.lang.php. I use something like this in the override file:
PHP Code:
foreach(array(
'LBL_MODULE_NAME' => 'Organizations',
'LBL_MODULE_TITLE' => 'Organizations',
// etc.
) as $k => $v) $mod_strings[$k] = $v;
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