Merge language and theme into resource folder

Wox.Core/Resource/AvailableLanguages.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+
+namespace Wox.Core.Resource
+{
+    internal static class AvailableLanguages
+    {
+        public static Language English = new Language("en", "English");
+        public static Language Chinese = new Language("zh-cn", "中文");
+        public static Language Chinese_TW = new Language("zh-tw", "中文（繁体）");
+        public static Language Russian = new Language("ru", "Русский");
+        public static Language French = new Language("fr", "Français");
+
+        public static List<Language> GetAvailableLanguages()
+        {
+            List<Language> languages = new List<Language>
+            {
+                English, 
+                Chinese, 
+                Chinese_TW,
+                Russian,
+                French
+            };
+            return languages;
+        }
+    }
+}