lang: Add danish to the application

Author: Belphemur

SoundSwitch/Localization/Factory/Lang/Langs.cs

@@ -235,4 +235,14 @@ public class Serbian : BaseLang
         public override Language TypeEnum => Language.Serbian;
     }
 
+    public class Danish : BaseLang
+    {
+        /// <summary>
+        /// Culture info of this language
+        /// </summary>
+        public override CultureInfo CultureInfo => CultureInfo.GetCultureInfo("da");
+
+        public override Language TypeEnum => Language.Danish;
+    }
+    
 }

SoundSwitch/Localization/Factory/Language.cs

@@ -41,6 +41,7 @@ public enum Language
         Turkish,
         Arabic,
         Thai,
-        Serbian
+        Serbian,
+        Danish
     }
 }

SoundSwitch/Localization/Factory/LanguageFactory.cs

@@ -31,7 +31,8 @@ public LanguageFactory() : base(new EnumImplList<Language, ILang>
             new Turkish(),
             new Arabic(),
             new Thai(),
-            new Serbian()
+            new Serbian(),
+            new Danish()
         })
         {
         }