If you want to localize the course by using an XLIFF file, select the course from where the original XLIFF file was saved. Then click Localize in the top right corner.
First, select the target language on the form that is displayed. Use the selection slider to specify whether the XLIFF file was translated by replacing the original text or whether a new target language was created in addition to it.
Then select the XLIFF file on your device by clicking Select XLIFF file. Finally, click Localize and you will see a confirmation that the localization operation was successful.