Oh, right. There’s now also a way to open input method settings. Click the globe and then “settings”. Then you add new input languages to your system, and they will show up in Squeekboard. Choose one by clicking the globe button, they will all be on the list.
I started that before discovering that gnome-desktop already offers translations for layout names. Now it’s only a fallback in case gnome-desktop doesn’t know the translation, which is rather rare (but I never checked how rare).
Other than the above, no. But that should change now that we have the settings option which always needs a translation. Haven’t decided on any particular system for that yet.