Add Liberty Dark map theme, change map theme names

www/settings.js

@@ -11,7 +11,13 @@ var SETTINGS = {
         liberty: {
             url: "https://maps.netsyms.net/styles/osm-liberty/{z}/{x}/{y}.png",
             json: "https://maps.netsyms.net/styles/osm-liberty/style.json",
-            name: "Liberty",
+            name: "Light",
+            bgcolor: "#EFEFEF"
+        },
+        libertydark: {
+            url: "https://maps.netsyms.net/styles/osm-liberty-dark/{z}/{x}/{y}.png",
+            json: "https://maps.netsyms.net/styles/osm-liberty-dark/style.json",
+            name: "Dark",
             bgcolor: "#EFEFEF"
         },
         terrain: {
@@ -23,13 +29,13 @@ var SETTINGS = {
         fiord: {
             url: "https://maps.netsyms.net/styles/fiord-color/{z}/{x}/{y}.png",
             json: "https://maps.netsyms.net/styles/fiord-color/style.json",
-            name: "Dark Fiord",
+            name: "Blue",
             bgcolor: "#45516E"
         },
         oledblack: {
             url: "https://maps.netsyms.net/styles/oled-black/{z}/{x}/{y}.png",
             json: "https://maps.netsyms.net/styles/oled-black/style.json",
-            name: "OLED Black",
+            name: "Black",
             bgcolor: "#000000"
         }
     },