"Set date to {X}" tooltip is always in english locale

[Vladimir Mitin]

When using display="years" we see tooltip like "Set Date to Septemper 1st, 2018", even though locale is not english

here are my locale settings

                                locale={{
                                    locale: require('date-fns/locale/ru'),
                                    headerFormat: 'MMM YYYY'
                                }}

as I can see here, tooltip text is taken from "title", and it is not localized.

Is there any way to switch the tooltip off?