The first step, as usual, go to the Sitecore setting and add the needed new language,
After that go back to your site and add the language selector component, which is available in the SXA toolbox.
The last step we need to add the language which I added before in the settings to SXA site, then the language will be shown in this component.
To do that:
- Select your site under the tenant in the content editor.
- Right click on the site.
- Choose script menu
- Click on add site language,
In the popup dialog choose from the dropdown list "New Language" the second language,
Go back to your language selector and you can see the second language comes and you can select it.
