Added DeepL action setting

I18N Commander/UI WinForms/Components/Setting.cs

@@ -108,9 +108,51 @@ public sealed partial class Setting : UserControl
 
         return new Setting(settingData);
     }
+    
+    private static async Task<Setting> ShowDeepLActionSettingAsync()
+    {
+        var currentSetting = await AppSettings.GetDeepLAction();
+        var settingData = new SettingUIData(
+            Icon: Icons.icons8_play_512__2_,
+            SettingName: () => "DeepL Operation",
+            SettingExplanation: () => "Should the missing translations be automatically completed by DeepL? This can lead to higher costs. By default, DeepL is only applied manually.",
+            SetupDataControl: () =>
+            {
+                // We set up a combo box with the available actions:
+                var dropdown = new ComboBox();
+                dropdown.Items.Add("Manual");
+                dropdown.Items.Add("Automatic");
+                dropdown.SelectedIndex = currentSetting switch
+                {
+                    SettingDeepLAction.MANUAL => 0,
+                    SettingDeepLAction.AUTOMATIC_ALL => 1,
+                    
+                    _ => 0,
+                };
+                
+                // Setup the change event handler:
+                dropdown.SelectedValueChanged += async (sender, args) => await AppSettings.SetDeepLAction(dropdown.SelectedIndex switch
+                {
+                    0 => SettingDeepLAction.MANUAL,
+                    1 => SettingDeepLAction.AUTOMATIC_ALL,
+                    
+                    _ => SettingDeepLAction.MANUAL,
+                });
+                
+                // Apply the desired layout:
+                dropdown.Dock = DockStyle.Fill;
+                dropdown.DropDownStyle = ComboBoxStyle.DropDownList;
+
+                return dropdown;
+            }
+        );
+
+        return new Setting(settingData);
+    }
 
     public static IEnumerable<Task<Setting>> GetAllSettings()
     {
+        yield return ShowDeepLActionSettingAsync();
         yield return ShowDeepLAPIKeySettingAsync();
         yield return ShowDeepLModeSettingAsync();
     }