BuddyPress.org

If you’re using BP 1.2.7, simply put your buddypress language files in:
/wp-content/languages/

Make sure your language files are named like:
`buddypress-vi.po
buddypress-vi.mo
`
If you’re using an older version of BP, read step 3 of this guide:
https://codex.buddypress.org/extending-buddypress/customizing-labels-messages-and-urls/