To import the translation terms, follow these steps:

1. In the web client user interface, from the Settings top menu, select the Translations | Import/Export | Import Translation menu option.
2. On the Import Translations dialog, fill out the language name and the language code, and select the file to import. Finally, click on the Import button to perform the action:
   
3. To import a translation file from the Odoo command-line interface, we must place it inside the server addons path and then perform the import:

    $ mv myfile.po ./addons/
    $ ./odoo.py -d mydb --i18n-import="myfile.po" --lang=es_ES