Add Japanese localization (#1157)

* Initial Japanese translation

Only a small part was translated

* Unspecified words will be in English

When new words are added, they will be displayed in English even if Japanese support is delayed.

* Expanded translation scope

* Expanded translation scope

* Proceed with translation with a focus on overall settings

* Re-translated the outdated settings screen

* Add items that only exist in the latest en_US and remove items that do not exist in en_US

* A lot of translation work done

* A lot more translation work has been done

* ja_JP.axaml has been translated into Japanese

* Fixed three incomplete parts of the Japanese translation

Author: SousiOmine

src/App.axaml

@@ -20,6 +20,7 @@
       <ResourceInclude x:Key="zh_CN" Source="/Resources/Locales/zh_CN.axaml"/>
       <ResourceInclude x:Key="zh_TW" Source="/Resources/Locales/zh_TW.axaml"/>
       <ResourceInclude x:Key="es_ES" Source="/Resources/Locales/es_ES.axaml"/>
+      <ResourceInclude x:Key="ja_JP" Source="/Resources/Locales/ja_JP.axaml"/>
     </ResourceDictionary>
   </Application.Resources>
 

src/Models/Locales.cs

@@ -17,6 +17,7 @@ public class Locale
             new Locale("Русский", "ru_RU"),
             new Locale("简体中文", "zh_CN"),
             new Locale("繁體中文", "zh_TW"),
+            new Locale("日本語", "ja_JP"),
         };
 
         public Locale(string name, string key)