The Cancel / Save-and-add-another / Save actions were a fixed Row that
could not shrink, so on narrow phones and long locales (es/pt/de/fr) the
buttons overflowed the right edge (the clipped 'Guardar'). Replace it with
an OverflowBar that wraps onto stacked, end-aligned lines when they don't
fit; move the added-count onto its own line above.
Guard it in small_screen_overflow_test.dart across the long locales.
vjrj
dc0d18562f