Language switching problem

Hello !,
I have problem with my site which use opencart 1.5.5.1. I installed 2 languages, English and Indonesian. Now I can not switch all module to indonesian language. In admin panel, language switching to Indonesian is no problem, but in front store module language can not switch to indonesian. Only shopping cart and some modules that install by myself can be switched to indonesian. Module latest product, featured product and etc can not switch to indonesian. I tried to rename the the language file of english and indonesian to something else even i deleted the language file, language is still in english.

I already clear all browser cache, but problem still happened.
Can anyone help me?

Thanks

Did you flush both /system/cache/ and /vqmod/vqcache/ files and the /vqmod/ cache file?