Nothing in sections 1401 to 1401e of this title shall be construed as altering, amending, or repealing exemptions from taxation, existing on May 26, 1936, of property used for educational, charitable, or religious purposes. Subject to the provisions of said sections, the legislative authority of the respective municipalities is empowered to alter, amend, or repeal, subject to the approval of the Governor, any law imposing taxes on real and personal property on May 26, 1936.