if anyone else is like me, i had problems trying to delete unused languages using the instructions found on the "how do i free up memory" link below
How do I free up memory on my device? - BlackBerryFAQ
i have discovered that the way to delete unused languages on the curve since they do not appear under the options-->advanced options-->applications heading is through the setup wizard.
simply open the setup wizard, click on the language option, and check/uncheck the languages you would like to keep/delete, etc...