The term “municipal court” or “municipal judge” whenever used in this act shall be deemed to include all municipal courts and judges heretofore or hereafter established or authorized under the provisions of Act No. 279 of the Public Acts of 1909, as amended, being section 117.1 to 117.38 of the Compiled Laws of 1948, and Act No. 269 of the Public Acts of 1933, as amended, being section 730.101 to 730.159 of the Compiled Laws of 1948; and all of the provisions of this act shall be deemed to apply to such courts, in addition to and not in derogation of the provisions of the statutes and charters under which such courts have been or may hereafter be organized.