Council Regulation (EU, Euratom) 2015/2264 of 3 December 2015 extending and phasing out the temporary derogation measures from Regulation No 1 of 15 April 1958 determining the languages to be used by the European Economic Community and Regulation No 1 of 15 April 1958 determining the languages to be used by the European Atomic Energy Community introduced by Regulation (EC) No 920/2005