Add LangName property to language plugin interface and implementation

app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua

@@ -44,6 +44,9 @@ DEPRECATION_MESSAGE = ""
 -- code followed by the ISO 3166-1 country code:
 IETF_TAG = "de-DE"
 
+-- The language name in the user's language:
+LANG_NAME = "Deutsch (Deutschland)"
+
 UI_TEXT_CONTENT = {
     HOME = CONTENT_HOME,
 }

app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua

@@ -44,6 +44,9 @@ DEPRECATION_MESSAGE = ""
 -- code followed by the ISO 3166-1 country code:
 IETF_TAG = "en-US"
 
+-- The language name in the user's language:
+LANG_NAME = "English (United States)"
+
 UI_TEXT_CONTENT = {
     HOME = CONTENT_HOME,
 }

app/MindWork AI Studio/Tools/PluginSystem/ILanguagePlugin.cs

@@ -23,4 +23,9 @@ public interface ILanguagePlugin
     /// Gets the IETF tag of the language plugin.
     /// </summary>
     public string IETFTag { get; }
+    
+    /// <summary>
+    /// Gets the name of the language.
+    /// </summary>
+    public string LangName { get; }
 }

app/MindWork AI Studio/Tools/PluginSystem/PluginLanguage.cs

@@ -7,6 +7,7 @@ public sealed class PluginLanguage : PluginBase, ILanguagePlugin
     private readonly Dictionary<string, string> content = [];
     private readonly List<ILanguagePlugin> otherLanguagePlugins = [];
     private readonly string langCultureTag;
+    private readonly string langName;
     
     private ILanguagePlugin? baseLanguage;
     
@@ -15,6 +16,9 @@ public sealed class PluginLanguage : PluginBase, ILanguagePlugin
         if(!this.TryInitIETFTag(out var issue, out this.langCultureTag))
             this.pluginIssues.Add(issue);
         
+        if(!this.TryInitLangName(out issue, out this.langName))
+            this.pluginIssues.Add(issue);
+        
         if (this.TryInitUITextContent(out issue, out var readContent))
             this.content = readContent;
         else
@@ -127,7 +131,32 @@ public sealed class PluginLanguage : PluginBase, ILanguagePlugin
         message = string.Empty;
         return true;
     }
+    
+    private bool TryInitLangName(out string message, out string readLangName)
+    {
+        if (!this.state.Environment["LANG_NAME"].TryRead(out readLangName))
+        {
+            message = "The field LANG_NAME does not exist or is not a valid string.";
+            readLangName = string.Empty;
+            return false;
+        }
+        
+        if (string.IsNullOrWhiteSpace(readLangName))
+        {
+            message = "The field LANG_NAME is empty. Use a valid language name.";
+            readLangName = string.Empty;
+            return false;
+        }
+        
+        message = string.Empty;
+        return true;
+    }
 
     /// <inheritdoc />
     public string IETFTag => this.langCultureTag;
+    
+    /// <inheritdoc />
+    public string LangName => this.langName;
+
+    #endregion
 }