Label language follows device, not app UI language?

On my DAB Fields tool I have defined some labels for the fields. There is a translations button, so I thought I would put in different labels for different languages, like this:

But it appears to follow the DEVICE language, not the UI language selected in the app. So on my English phone, if I set the app UI language to French, it still shows me the English label. (That seems to be the intended behavior from the help text there, but that seems wrong to me, if you can follow the app UI language.)

One other small thing: If you change the label in the main dialog, then click the Translations… button, the changed label is not shown as the default. You have to change the label, click OK, re-open the field, then click the Translations… button to see your update.