diff --git a/I18N Commander/UI WinForms/Components/Translation.Designer.cs b/I18N Commander/UI WinForms/Components/Translation.Designer.cs
index f5878d2..dc5cb15 100644
--- a/I18N Commander/UI WinForms/Components/Translation.Designer.cs	
+++ b/I18N Commander/UI WinForms/Components/Translation.Designer.cs	
@@ -87,7 +87,7 @@
             this.buttonDeepL.Name = "buttonDeepL";
             this.buttonDeepL.Size = new System.Drawing.Size(60, 60);
             this.buttonDeepL.TabIndex = 2;
-            this.toolTip.SetToolTip(this.buttonDeepL, "Auto-generate this text by using DeepL");
+            this.toolTip.SetToolTip(this.buttonDeepL, "Auto-generate this text by using DeepL sourced by the source culture.");
             this.buttonDeepL.UseVisualStyleBackColor = true;
             // 
             // toolTip
diff --git a/I18N Commander/UI WinForms/Components/Translation.cs b/I18N Commander/UI WinForms/Components/Translation.cs
index 6bd5590..8536f08 100644
--- a/I18N Commander/UI WinForms/Components/Translation.cs	
+++ b/I18N Commander/UI WinForms/Components/Translation.cs	
@@ -1,6 +1,7 @@
 using System.Timers;
 using DataModel.Database;
 using Processor;
+using UI_WinForms.Resources;
 using Timer = System.Timers.Timer;
 
 namespace UI_WinForms.Components;
@@ -10,8 +11,9 @@ public sealed partial class Translation : UserControl
     private readonly string culture = "en-US";
     private readonly Timer saveTimer;
     
-    private int currentTranslationId = -1;
     private bool isLoading = false;
+    private int currentTranslationId = -1;
+    private bool isDeepLSourceCulture = false;
 
     public Translation()
     {
@@ -19,11 +21,11 @@ public sealed partial class Translation : UserControl
         this.Dock = DockStyle.Top;
     }
 
-    public Translation(string cultureCode)
+    public Translation(AppSettings.CultureInfo cultureInfo)
     {
         this.InitializeComponent();
-        this.culture = cultureCode;
-        this.labelHead.Text = $"Culture: {cultureCode}";
+        this.culture = cultureInfo.Code;
+        this.labelHead.Text = $"Culture: {cultureInfo.Code}";
         this.Dock = DockStyle.Top;
         this.saveTimer = new Timer
         {
@@ -32,12 +34,20 @@ public sealed partial class Translation : UserControl
             AutoReset = false, // runs only once
         };
         this.saveTimer.Elapsed += this.SaveChanges;
-        this.Load += async (sender, args) => await this.LateSetup();
+        this.Load += async (sender, args) => await this.LateSetup(cultureInfo);
     }
 
-    private async Task LateSetup()
+    private async Task LateSetup(AppSettings.CultureInfo cultureInfo)
     {
+        this.isDeepLSourceCulture = await AppSettings.GetDeepLSourceCultureIndex() == cultureInfo.Index;
         this.buttonDeepL.Visible = await AppSettings.GetDeepLMode() != SettingDeepLMode.DISABLED;
+        this.buttonDeepL.Image = this.isDeepLSourceCulture ? Icons.icons8_trigger_1__svg : Icons.deepl_logo_icon_170284;
+
+        if (this.isDeepLSourceCulture)
+        {
+            this.labelHead.Text = $"Culture: {cultureInfo.Code} (DeepL source culture)";
+            this.toolTip.SetToolTip(this.buttonDeepL, "Replaces all other translations by DeepL translations using this culture as source culture.\nWarning: already translated texts will be replaced as well.");
+        }
     }
 
     private async void SaveChanges(object? sender, ElapsedEventArgs e)
diff --git a/I18N Commander/UI WinForms/Components/Translations.cs b/I18N Commander/UI WinForms/Components/Translations.cs
index 5d8e7fc..40b2a59 100644
--- a/I18N Commander/UI WinForms/Components/Translations.cs	
+++ b/I18N Commander/UI WinForms/Components/Translations.cs	
@@ -46,7 +46,7 @@ public partial class Translations : UserControl
 
         await foreach (var cultureInfo in DesiredOrder())
         {
-            var translationComponent = new Translation(cultureInfo.Code);
+            var translationComponent = new Translation(cultureInfo);
             this.translationComponents.Add(cultureInfo.Code, translationComponent);
             this.panelTranslations.Controls.Add(translationComponent);
         }
diff --git a/I18N Commander/UI WinForms/Resources/Icons.Designer.cs b/I18N Commander/UI WinForms/Resources/Icons.Designer.cs
index 3110d9e..cedf6c1 100644
--- a/I18N Commander/UI WinForms/Resources/Icons.Designer.cs	
+++ b/I18N Commander/UI WinForms/Resources/Icons.Designer.cs	
@@ -319,5 +319,15 @@ namespace UI_WinForms.Resources {
                 return ((System.Drawing.Bitmap)(obj));
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap icons8_trigger_1__svg {
+            get {
+                object obj = ResourceManager.GetObject("icons8_trigger_1__svg", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
     }
 }
diff --git a/I18N Commander/UI WinForms/Resources/Icons.resx b/I18N Commander/UI WinForms/Resources/Icons.resx
index 2273449..9cfa843 100644
--- a/I18N Commander/UI WinForms/Resources/Icons.resx	
+++ b/I18N Commander/UI WinForms/Resources/Icons.resx	
@@ -196,4 +196,7 @@
   <data name="icons8_trash_can_512" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>icons8-trash-can-512.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
   </data>
+  <data name="icons8_trigger_1__svg" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>icons8-trigger(1).svg.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/I18N Commander/UI WinForms/Resources/icons8-trigger(1).svg.png b/I18N Commander/UI WinForms/Resources/icons8-trigger(1).svg.png
new file mode 100644
index 0000000..d0e5863
Binary files /dev/null and b/I18N Commander/UI WinForms/Resources/icons8-trigger(1).svg.png differ