World Rugby Handbook
BYE-LAW 15. INTERPRETATION
(a) In the event of a doubt arising at any time on a matter not provided for in, or as to the meaning or construction of the Bye-Laws, the Council shall be requested to determine the same.
(b) These Bye-Laws and any Regulations Relating to the Game, General Regulations or Laws of the Game made pursuant thereto shall in all respects be governed by and construed in accordance with English Law, and any dispute arising there under shall be subject to the exclusive jurisdiction of the English Courts.
(c) English shall be the official language of World Rugby.
(d) Unless the context otherwise requires in these Bye-Laws the masculine gender shall include the feminine gender and the singular shall include the plural and vice versa.