The language profile and Japanese layout selects labelled mixed values
with "labels.mixed-values", a key that no longer exists, so they showed
the raw key. Use "settings.multiple", as the other text options do.
The "No language profile" choice had a blank id, which the select shows
as "--". Give it the "plain" id and map it back to no language.
AI-assisted-by: claude-opus-5-5