Python Holidays 0.45 - en to en_US translation catalogue (3 entries)

note: Labour Day.
en: Labour Day
en_US: Labor Day

note: The Fete Dieu.
en: The Fete Dieu
en_US: Corpus Christi

note: The Feast of the Immaculate Conception.
en: The Feast of the Immaculate Conception
en_US: Immaculate Conception
