Added cusotm color group string

Author: Eric Weintraub

src/loc/en-us.ts

@@ -128,6 +128,7 @@ define([], () => {
     ThemeColorsGroupName: "Theme colors",
     HighlightColorsGroupName: "Highlight colors",
     StandardColorsGroupName: "Standard colors",
+    CustomColorsGroupName: "Custom Colors",
     ThemeColorDarker: "Theme darker",
     ThemeColorDark: "Theme dark",
     ThemeColorDarkAlt: "Theme dark alternate",

src/loc/mystrings.d.ts

@@ -100,6 +100,7 @@ declare interface IControlStrings {
   ThemeColorsGroupName: string;
   HighlightColorsGroupName: string;
   StandardColorsGroupName: string;
+  CustomColorsGroupName: string;
   ColorsGroupName: string;
   ThemeColorDarker: string;
   ThemeColorDark: string;