For manage languages please follow the next steps:

1. Login to System Admin Panel.
2. Select Language menu from left side bar.
3. From Language List Click Update label button to update language label/phrase
4. To Edit your language name click Edit button. 
5. To activate your expected language click Activate button.
6. To delete unnecessary language click Delete button.
7. To add new language click  Add Language tab and fill up fields with data/value.
8. You are done with Language module.