Adapt the interface to the user's locale

[machawk1]

Currently, the month names and ordinal days are in en format, e.g., 2020 > March > 2nd. It should adapt to a user's locale. In #309, @ibnesayeed provided a parameterized function to allow adaptation to a locale provided. For comparison with the memento-datetime header, en is needed, but the interface itself can display other values.

If these values are read onclick, the will need to be converted back to the form for comparison.