Millimetres -> Millimeters

pcbnew/board_design_settings.cpp

@@ -771,7 +771,7 @@ bool BOARD_DESIGN_SETTINGS::migrateSchema0to1()
      *
      * 0: Inches
      * 1: Mils
-     * 2: Millimetres
+     * 2: Millimeters
      */
     std::string units_ptr( "defaults.dimension_units" );
     std::string precision_ptr( "defaults.dimension_precision" );

pcbnew/plugins/cadstar/cadstar_pcb_archive_loader.cpp

@@ -3629,7 +3629,7 @@ void CADSTAR_PCB_ARCHIVE_LOADER::applyDimensionSettings( const DIMENSION&  aCads
     case UNITS::CENTIMETER:
     case UNITS::MICROMETRE:
         wxLogWarning( wxString::Format( _( "Dimension ID %s uses a type of unit that "
-                                           "is not supported in KiCad. Millimetres were "
+                                           "is not supported in KiCad. Millimeters were "
                                            "applied instead." ),
                                         aCadstarDim.ID ) );
         KI_FALLTHROUGH;