I created a po file from english po file to my country language id_ID folder and saved as messages.po

but to my surprise it didn't use my translated file. all other plugins translated file works but not the theme translation.

is there something I need to do? my site only has one language.

Thanks

@ysalim
Where is translation file?
Did you use PO Edit?

Note that theme does not handle translations, it is handled by osclass core.

I am sorry, my bad i named the file incorrectly... it should say theme.po 

@ysalim
Cool, so problem fixed right?