feat(MainWindow): add localization options to UI

  src/ClusterRelocationService/MainWindow.xaml: +added localization options group with language selection
  Class MainWindow: +added properties for available languages and selected language code; +initialize language options on startup

feat(LocalizationManager): enhance language handling

  src/Localization/LocalizationManager.cs: +added methods for translating language names and retrieving display names

feat(translations): add localization support for multiple languages

  src/ClusterRelocationService/Translations/*.json: +added language entries and localization options for various languages

Author: chemodun

src/ClusterRelocationService/MainWindow.xaml

@@ -390,6 +390,26 @@
                                   IsChecked="{Binding LogToFile}"/>
                     </StackPanel>
                 </fluent:RibbonGroupBox>
+                <fluent:RibbonGroupBox Header="{loc:Loc Key=ribbon.group.localizationOptions}">
+                    <Grid Margin="0">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="Auto"/>
+                            <ColumnDefinition Width="*"/>
+                        </Grid.ColumnDefinitions>
+                        <Label Content="{loc:Loc Key=config.localization.language}"
+                               Grid.Column="0"
+                               VerticalAlignment="Center"
+                               Margin="0,0,5,0"/>
+                        <ComboBox Grid.Column="1"
+                                  Width="100"
+                                  Margin="5"
+                                  ItemsSource="{Binding AvailableLanguages}"
+                                  DisplayMemberPath="DisplayName"
+                                  SelectedValuePath="Code"
+                                  SelectedValue="{Binding SelectedLanguageCode, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                                  ToolTip="{loc:Loc Key=config.localization.language.tooltip}"/>
+                    </Grid>
+                </fluent:RibbonGroupBox>
                 <fluent:RibbonGroupBox Header="{loc:Loc Key=ribbon.group.otherOptions}">
                     <StackPanel>
                         <CheckBox Content="{loc:Loc Key=config.other.checkUpdates}"

src/ClusterRelocationService/MainWindow.xaml.cs

@@ -16,6 +16,7 @@
 using System.Windows.Media.Imaging;
 using System.Windows.Threading;
 using System.Xml.Linq;
+using Localization;
 using SharedWindows;
 using Utilities.Logging;
 using X4DataLoader;
@@ -104,6 +105,7 @@ protected virtual void OnPropertyChanged(string propertyName)
   public class OtherConfig
   {
     private bool _checkForUpdatesOnStartUp = false;
+    private string _languageCode = "en";
     public bool CheckForUpdatesOnStartUp
     {
       get => _checkForUpdatesOnStartUp;
@@ -117,6 +119,20 @@ public bool CheckForUpdatesOnStartUp
       }
     }
 
+    public string? LanguageCode
+    {
+      get => _languageCode;
+      set
+      {
+        string newValue = string.IsNullOrWhiteSpace(value) ? _languageCode : value.Trim();
+        if (!string.Equals(_languageCode, newValue, StringComparison.OrdinalIgnoreCase))
+        {
+          _languageCode = newValue;
+          OnPropertyChanged(nameof(LanguageCode));
+        }
+      }
+    }
+
     public event PropertyChangedEventHandler? PropertyChanged;
 
     protected virtual void OnPropertyChanged(string propertyName)
@@ -125,12 +141,17 @@ protected virtual void OnPropertyChanged(string propertyName)
     }
   }
 
+  public sealed record LanguageOption(string Code, string DisplayName);
+
   /// <summary>
   /// Interaction logic for MainWindow.xaml
   /// </summary>
   public partial class MainWindow : Window, INotifyPropertyChanged
   {
     private readonly string _configFileName;
+    private readonly ObservableCollection<LanguageOption> _availableLanguages = new();
+    private string _selectedLanguageCode = LocalizationManager.Shared.CurrentLanguage;
+    private string? _preferredLanguageFromConfig;
 
     private bool _directMode = true;
     public bool DirectMode
@@ -186,6 +207,30 @@ public string X4GameFolder
       }
     }
 
+    public ObservableCollection<LanguageOption> AvailableLanguages => _availableLanguages;
+
+    public string SelectedLanguageCode
+    {
+      get => _selectedLanguageCode;
+      set
+      {
+        string normalized = string.IsNullOrWhiteSpace(value) ? LocalizationManager.Shared.DefaultLanguage : value.Trim();
+
+        if (!_availableLanguages.Any(option => option.Code.Equals(normalized, StringComparison.OrdinalIgnoreCase)))
+        {
+          normalized = LocalizationManager.Shared.DefaultLanguage;
+        }
+
+        if (!string.Equals(_selectedLanguageCode, normalized, StringComparison.OrdinalIgnoreCase))
+        {
+          _selectedLanguageCode = normalized;
+          OnPropertyChanged(nameof(SelectedLanguageCode));
+          LocalizationManager.Shared.TrySetLanguage(_selectedLanguageCode);
+          SaveConfiguration();
+        }
+      }
+    }
+
     private bool _checkForUpdatesOnStartUp = false;
     public bool CheckForUpdatesOnStartUp
     {
@@ -794,6 +839,7 @@ public MainWindow()
     {
       _configFileName = $"{System.Reflection.Assembly.GetExecutingAssembly().GetName().Name}.json";
       LoadConfiguration();
+      InitializeLanguageOptions(_preferredLanguageFromConfig);
       InitializeComponent();
       DataContext = this;
       X4DataStructure.AddRange(
@@ -898,6 +944,7 @@ private void LoadConfiguration()
           LogToFile = logging.LogToFile;
 
           CheckForUpdatesOnStartUp = other.CheckForUpdatesOnStartUp;
+          _preferredLanguageFromConfig = other.LanguageCode;
         }
       }
       else
@@ -926,7 +973,7 @@ private void SaveConfiguration()
         Map = new MapConfig { MapColorsOpacity = MapColorsOpacity },
         Relocation = new RelocationConfig { ExportClustersIsEnabled = ExportClustersIsEnabled, FullMessIsEnabled = FullMessIsEnabled },
         Logging = new LoggingConfig { LogLevel = LogLevel, LogToFile = LogToFile },
-        Other = new OtherConfig { CheckForUpdatesOnStartUp = CheckForUpdatesOnStartUp },
+        Other = new OtherConfig { CheckForUpdatesOnStartUp = CheckForUpdatesOnStartUp, LanguageCode = SelectedLanguageCode },
       };
       if (X4UniverseId != DataLoader.DefaultUniverseId)
       {
@@ -951,6 +998,39 @@ private void SaveConfiguration()
       File.WriteAllText(_configFileName, jsonString);
     }
 
+    private void InitializeLanguageOptions(string? preferredLanguageCode)
+    {
+      var manager = LocalizationManager.Shared;
+      _availableLanguages.Clear();
+
+      var orderedLanguages = manager.AvailableLanguages.OrderBy(code => code, StringComparer.OrdinalIgnoreCase);
+      foreach (string code in orderedLanguages)
+      {
+        string displayName = manager.GetLanguageDisplayName(code, code);
+        _availableLanguages.Add(new LanguageOption(code, displayName));
+      }
+
+      if (_availableLanguages.Count == 0)
+      {
+        _selectedLanguageCode = manager.DefaultLanguage;
+        OnPropertyChanged(nameof(SelectedLanguageCode));
+        return;
+      }
+
+      string target = preferredLanguageCode;
+      if (
+        string.IsNullOrWhiteSpace(target)
+        || !_availableLanguages.Any(option => option.Code.Equals(target, StringComparison.OrdinalIgnoreCase))
+      )
+      {
+        target = manager.CurrentLanguage;
+      }
+
+      _selectedLanguageCode = target;
+      OnPropertyChanged(nameof(SelectedLanguageCode));
+      manager.TrySetLanguage(target);
+    }
+
     private void X4DataNotLoadedCheckAndWarning()
     {
       // Validate the loaded X4DataFolder

src/ClusterRelocationService/Translations/bn.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "\u0995\u09be\u0982\u09b2\u09be"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/cs.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "\u010ce\u0161tina"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/de.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "Deutsch"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/en.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "English"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/es.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "Espa\u00f1ol"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/fr.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "Fran\u00e7ais"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {

src/ClusterRelocationService/Translations/it.json

@@ -2,6 +2,9 @@
   "app": {
     "title": "Cluster Relocation Service"
   },
+  "language": {
+    "name": "Italiano"
+  },
   "ribbon": {
     "tab": {
       "mod": "Mod",
@@ -19,7 +22,8 @@
       "relocationOptions": "Relocation Options",
       "loggingOptions": "Logging Options",
       "otherOptions": "Other Options",
-      "helpActions": "Help Actions"
+      "helpActions": "Help Actions",
+      "localizationOptions": "Localization Options"
     },
     "mod": {
       "new": "New",
@@ -61,6 +65,10 @@
     },
     "other": {
       "checkUpdates": "Check for Updates on StartUp"
+    },
+    "localization": {
+      "language": "Language:",
+      "language.tooltip": "Select the interface language"
     }
   },
   "logging": {