You are correct in your assumption. Words Cemeteries, Cimetières and Kyrkogardar are reserved words for regional groups.
There are some other categories, that use Cemeteries reserved word that need to be renamed:
Category:Chilliwack_Cemeteries,_Chilliwack,_British_Columbia
Category:Edith_Ford_Memorial_Cemeteries,_Canadian,_Texas
Category:Madison_Historic_Cemeteries,_Madison,_Georgia
Category:Nakusp_Cemeteries,_Nakusp,_British_Columbia
Category:Oakland_Masonic_and_Old_Town_Oakland_Cemeteries,_Oakland,_Oregon
Category:Ross_Fork_Cemeteries,_Fort_Hall,_Idaho
Category:Sherith_Israel_and_West_End_Synagogue_Cemeteries,_Nashville,_Tennessee
Category:Silver_Terrace_Cemeteries,_Virginia_City,_Nevada
Category:Small_Pox_Cemeteries_of_Stonington,_Stonington,_Connecticut
Category:United_Cemeteries,_Allegheny_County,_Pennsylvania
Category:United_Cemeteries,_Beckwith_Township,_Ontario