fix(Language): Add Japanese language

Fix #552

Author: Belphemur

SoundSwitch/Localization/Factory/Lang/Langs.cs

@@ -168,4 +168,15 @@ public class SlovenianLang : ILang
         public Language TypeEnum => Language.Slovenian;
         public string Label => "Slovenščina";
     }
+    
+    public class JapaneseLang : ILang
+    {
+        /// <summary>
+        /// Culture info of this language
+        /// </summary>
+        public CultureInfo CultureInfo => CultureInfo.GetCultureInfo("jp");
+
+        public Language TypeEnum => Language.Japanese;
+        public string Label => "日本語";
+    }
 }

SoundSwitch/Localization/Factory/Language.cs

@@ -34,6 +34,7 @@ public enum Language
         Dutch,
         Croatian,
         ChineseTrad,
-        Slovenian
+        Slovenian,
+        Japanese
     }
 }

SoundSwitch/Localization/Factory/LanguageFactory.cs

@@ -23,7 +23,8 @@ public LanguageFactory() : base(new EnumImplList<Language, ILang>
             new DutchLang(),
             new CroatianLang(),
             new ChineseTraditionalLang(),
-            new SlovenianLang()
+            new SlovenianLang(),
+            new JapaneseLang()
         })
         {
         }