If you play on PC, there's also this 3 year old addon: https://www.esoui.com/downloads/info2869-BurningLanguageSelector.html#info
The addon appears to change the text language via its settings, which means the change remains between play sessions. However, it doesn't appear to provide any shortcut key for this, according to the 1 comment on the addon page. The addon can be modified to support these shortcut keys, someone just needs to do the update.
It was last updated 3 years ago, though, so there's no guarantee it still works, or that it works properly, so caveat emptor.