Add Serbian translation file
Add Serbian translation file

stalien/traccar_test,renaudallard/traccar,tsmgeek/traccar,AnshulJain1985/Roadcast-Tracker,ninioe/traccar,al3x1s/traccar,tananaev/traccar,orcoliver/traccar,orcoliver/traccar,5of9/traccar,duke2906/traccar,orcoliver/traccar,jssenyange/traccar,renaudallard/traccar,jon-stumpf/traccar,jon-stumpf/traccar,tananaev/traccar,jon-stumpf/traccar,joseant/traccar-1,ninioe/traccar,vipien/traccar,tsmgeek/traccar,stalien/traccar_test,5of9/traccar,vipien/traccar,duke2906/traccar,joseant/traccar-1,ninioe/traccar,al3x1s/traccar,tananaev/traccar,AnshulJain1985/Roadcast-Tracker,jssenyange/traccar,jssenyange/traccar,tsmgeek/traccar