First login into the admin and then click Language management.
Multilanguage Manage page will appear.click Add new in the right top most of the page.
Add New Language page will appears..Fill all the field which is mentioned below:
Language code–>after giving this click submit button in the bottom of the page.
After Submitting ,it will shows in the already existing multilanguage manage list page.
The language should be in active means click INACTIVE status as ACTIVE.
If need to edit the particular language details –>click edit button.