Add font names for macOS Catalina

`.SFNSText` doesn’t work on Catalina, so I updated the font definitions to include new names that work.

system-font.css

@@ -4,54 +4,54 @@
 	font-family: system-ui;
 	font-style: normal;
 	font-weight: 300;
-	src: local(".SFNSText-Light"), local(".HelveticaNeueDeskInterface-Light"), local(".LucidaGrandeUI"), local("Segoe UI Light"), local("Ubuntu Light"), local("Roboto-Light"), local("DroidSans"), local("Tahoma");
+	src: local(".SFNS-Light"), local(".SFNSText-Light"), local(".HelveticaNeueDeskInterface-Light"), local(".LucidaGrandeUI"), local("Segoe UI Light"), local("Ubuntu Light"), local("Roboto-Light"), local("DroidSans"), local("Tahoma");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: italic;
 	font-weight: 300;
-	src: local(".SFNSText-LightItalic"), local(".HelveticaNeueDeskInterface-Italic"), local(".LucidaGrandeUI"), local("Segoe UI Light Italic"), local("Ubuntu Light Italic"), local("Roboto-LightItalic"), local("DroidSans"), local("Tahoma");
+	src: local(".SFNS-LightItalic"), local(".SFNSText-LightItalic"), local(".HelveticaNeueDeskInterface-Italic"), local(".LucidaGrandeUI"), local("Segoe UI Light Italic"), local("Ubuntu Light Italic"), local("Roboto-LightItalic"), local("DroidSans"), local("Tahoma");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: normal;
 	font-weight: 400;
-	src: local(".SFNSText-Regular"), local(".HelveticaNeueDeskInterface-Regular"), local(".LucidaGrandeUI"), local("Segoe UI"), local("Ubuntu"), local("Roboto-Regular"), local("DroidSans"), local("Tahoma");
+	src: local(".SFNS-Regular"), local(".SFNSText-Regular"), local(".HelveticaNeueDeskInterface-Regular"), local(".LucidaGrandeUI"), local("Segoe UI"), local("Ubuntu"), local("Roboto-Regular"), local("DroidSans"), local("Tahoma");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: italic;
 	font-weight: 400;
-	src: local(".SFNSText-Italic"), local(".HelveticaNeueDeskInterface-Italic"), local(".LucidaGrandeUI"), local("Segoe UI Italic"), local("Ubuntu Italic"), local("Roboto-Italic"), local("DroidSans"), local("Tahoma");
+	src: local(".SFNS-Italic"), local(".SFNSText-Italic"), local(".HelveticaNeueDeskInterface-Italic"), local(".LucidaGrandeUI"), local("Segoe UI Italic"), local("Ubuntu Italic"), local("Roboto-Italic"), local("DroidSans"), local("Tahoma");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: normal;
 	font-weight: 500;
-	src: local(".SFNSText-Medium"), local(".HelveticaNeueDeskInterface-MediumP4"), local(".LucidaGrandeUI"), local("Segoe UI Semibold"), local("Ubuntu Medium"), local("Roboto-Medium"), local("DroidSans-Bold"), local("Tahoma Bold");
+	src: local(".SFNS-Medium"), local(".SFNSText-Medium"), local(".HelveticaNeueDeskInterface-MediumP4"), local(".LucidaGrandeUI"), local("Segoe UI Semibold"), local("Ubuntu Medium"), local("Roboto-Medium"), local("DroidSans-Bold"), local("Tahoma Bold");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: italic;
 	font-weight: 500;
-	src: local(".SFNSText-MediumItalic"), local(".HelveticaNeueDeskInterface-MediumItalicP4"), local(".LucidaGrandeUI"), local("Segoe UI Semibold Italic"), local("Ubuntu Medium Italic"), local("Roboto-MediumItalic"), local("DroidSans-Bold"), local("Tahoma Bold");
+	src: local(".SFNS-MediumItalic"), local(".SFNSText-MediumItalic"), local(".HelveticaNeueDeskInterface-MediumItalicP4"), local(".LucidaGrandeUI"), local("Segoe UI Semibold Italic"), local("Ubuntu Medium Italic"), local("Roboto-MediumItalic"), local("DroidSans-Bold"), local("Tahoma Bold");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: normal;
 	font-weight: 700;
-	src: local(".SFNSText-Bold"), local(".HelveticaNeueDeskInterface-Bold"), local(".LucidaGrandeUI"), local("Segoe UI Bold"), local("Ubuntu Bold"), local("Roboto-Bold"), local("DroidSans-Bold"), local("Tahoma Bold");
+	src: local(".SFNS-Bold"), local(".SFNSText-Bold"), local(".HelveticaNeueDeskInterface-Bold"), local(".LucidaGrandeUI"), local("Segoe UI Bold"), local("Ubuntu Bold"), local("Roboto-Bold"), local("DroidSans-Bold"), local("Tahoma Bold");
 }
 
 @font-face {
 	font-family: system-ui;
 	font-style: italic;
 	font-weight: 700;
-	src: local(".SFNSText-BoldItalic"), local(".HelveticaNeueDeskInterface-BoldItalic"), local(".LucidaGrandeUI"), local("Segoe UI Bold Italic"), local("Ubuntu Bold Italic"), local("Roboto-BoldItalic"), local("DroidSans-Bold"), local("Tahoma Bold");
+	src: local(".SFNS-BoldItalic"), local(".SFNSText-BoldItalic"), local(".HelveticaNeueDeskInterface-BoldItalic"), local(".LucidaGrandeUI"), local("Segoe UI Bold Italic"), local("Ubuntu Bold Italic"), local("Roboto-BoldItalic"), local("DroidSans-Bold"), local("Tahoma Bold");
 }