If a user sets the default language to Spanish (in the Edit Profile page), everything changes as expected. However, if said user logs out and then logs back in, the site reverts to English. My expectation is that this change should be permanent.
I have deselected the option to autodetect the language, but this has not fixed the issue.
Half of the employees that use this training site are Spanish speakers, so this is a significant issue that makes navigating the site difficult.
I have seen other forum posts that suggest looking at language settings, but the only options I can see for the language pack is to install or uninstall languages.