The option to change the platform's language through the settings doesn't actually change anything; it only notifies you of the change in a pop-up window, but it doesn't update to the selected language. However, using the drop-down button in the user section does change the language.
I've attached an image showing Spanish selected from the user drop-down menu, and in the background, the view from the settings with English still selected, while all the text on the platform is already in Spanish.

The option to change the platform's language through the settings doesn't actually change anything; it only notifies you of the change in a pop-up window, but it doesn't update to the selected language. However, using the drop-down button in the user section does change the language.
I've attached an image showing Spanish selected from the user drop-down menu, and in the background, the view from the settings with English still selected, while all the text on the platform is already in Spanish.