Add language behavior to the app settings

app/MindWork AI Studio/Components/Settings/SettingsPanelApp.razor

@@ -3,6 +3,17 @@
 @inherits SettingsPanelBase
 
 <ExpansionPanel HeaderIcon="@Icons.Material.Filled.Apps" HeaderText="App Options">
+    
+    @if (PreviewFeatures.PRE_PLUGINS_2025.IsEnabled(this.SettingsManager))
+    {
+        <ConfigurationSelect OptionDescription="Language behavior" SelectedValue="@(() => this.SettingsManager.ConfigurationData.App.LanguageBehavior)" Data="@ConfigurationSelectDataFactory.GetLangBehaviorData()" SelectionUpdate="@(selectedValue => this.SettingsManager.ConfigurationData.App.LanguageBehavior = selectedValue)" OptionHelp="Select the language behavior for the app. The default is to use the system language. You might want to choose a language manually?"/>
+        
+        @if (this.SettingsManager.ConfigurationData.App.LanguageBehavior is LangBehavior.MANUAL)
+        {
+            <ConfigurationSelect OptionDescription="Language" SelectedValue="@(() => this.SettingsManager.ConfigurationData.App.LanguagePluginId)" Data="@ConfigurationSelectDataFactory.GetLanguagesData()" SelectionUpdate="@(selectedValue => this.SettingsManager.ConfigurationData.App.LanguagePluginId = selectedValue)" OptionHelp="Select the language for the app."/>
+        }
+    }
+    
     <ConfigurationSelect OptionDescription="Color theme" SelectedValue="@(() => this.SettingsManager.ConfigurationData.App.PreferredTheme)" Data="@ConfigurationSelectDataFactory.GetThemesData()" SelectionUpdate="@(selectedValue => this.SettingsManager.ConfigurationData.App.PreferredTheme = selectedValue)" OptionHelp="Choose the color theme that best suits for you."/>
     <ConfigurationOption OptionDescription="Save energy?" LabelOn="Energy saving is enabled" LabelOff="Energy saving is disabled" State="@(() => this.SettingsManager.ConfigurationData.App.IsSavingEnergy)" StateUpdate="@(updatedState => this.SettingsManager.ConfigurationData.App.IsSavingEnergy = updatedState)" OptionHelp="When enabled, streamed content from the AI is updated once every third second. When disabled, streamed content will be updated as soon as it is available."/>
     <ConfigurationOption OptionDescription="Enable spellchecking?" LabelOn="Spellchecking is enabled" LabelOff="Spellchecking is disabled" State="@(() => this.SettingsManager.ConfigurationData.App.EnableSpellchecking)" StateUpdate="@(updatedState => this.SettingsManager.ConfigurationData.App.EnableSpellchecking = updatedState)" OptionHelp="When enabled, spellchecking will be active in all input fields. Depending on your operating system, errors may not be visually highlighted, but right-clicking may still offer possible corrections." />

app/MindWork AI Studio/Settings/ConfigurationSelectData.cs

@@ -6,6 +6,7 @@ using AIStudio.Assistants.TextSummarizer;
 using AIStudio.Assistants.EMail;
 using AIStudio.Provider;
 using AIStudio.Settings.DataModel;
+using AIStudio.Tools.PluginSystem;
 
 using WritingStylesRewrite = AIStudio.Assistants.RewriteImprove.WritingStyles;
 using WritingStylesEMail = AIStudio.Assistants.EMail.WritingStyles;
@@ -25,6 +26,21 @@ public readonly record struct ConfigurationSelectData<T>(string Name, T Value);
 /// </summary>
 public static class ConfigurationSelectDataFactory
 {
+    public static IEnumerable<ConfigurationSelectData<LangBehavior>> GetLangBehaviorData()
+    {
+        foreach (var behavior in Enum.GetValues<LangBehavior>())
+            yield return new(behavior.Name(), behavior);
+    }
+    
+    public static IEnumerable<ConfigurationSelectData<Guid>> GetLanguagesData()
+    {
+        foreach (var availablePlugin in PluginFactory.RunningPlugins)
+        {
+            if(availablePlugin is ILanguagePlugin languagePlugin)
+                yield return new(languagePlugin.LangName, availablePlugin.Id);
+        }
+    }
+    
     public static IEnumerable<ConfigurationSelectData<LoadingChatProviderBehavior>> GetLoadingChatProviderBehavior()
     {
         yield return new("When possible, use the LLM provider which was used for each chat in the first place", LoadingChatProviderBehavior.USE_CHAT_PROVIDER_IF_AVAILABLE);

app/MindWork AI Studio/Settings/DataModel/DataApp.cs

@@ -2,6 +2,16 @@ namespace AIStudio.Settings.DataModel;
 
 public sealed class DataApp
 {
+    /// <summary>
+    /// The language behavior.
+    /// </summary>
+    public LangBehavior LanguageBehavior { get; set; } = LangBehavior.AUTO;
+    
+    /// <summary>
+    /// The language plugin ID to use.
+    /// </summary>
+    public Guid LanguagePluginId { get; set; } = Guid.Empty;
+    
     /// <summary>
     /// The preferred theme to use.
     /// </summary>

app/MindWork AI Studio/Settings/DataModel/LangBehavior.cs

@@ -0,0 +1,7 @@
+namespace AIStudio.Settings.DataModel;
+
+public enum LangBehavior
+{
+    AUTO,
+    MANUAL,
+}

app/MindWork AI Studio/Settings/DataModel/LangBehaviourExtensions.cs

@@ -0,0 +1,12 @@
+namespace AIStudio.Settings.DataModel;
+
+public static class LangBehaviorExtensions
+{
+    public static string Name(this LangBehavior langBehavior) => langBehavior switch
+    {
+        LangBehavior.AUTO => "Choose the language automatically, based on your system language.",
+        LangBehavior.MANUAL => "Choose the language manually.",
+
+        _ => "Unknown option"
+    };
+}