Implemented copy function for text element's keys

I18N Commander/UI WinForms/Components/TextElements.cs

@@ -86,6 +86,13 @@ public partial class TextElements : UserControl
                 }
             }
         };
+        
+        // When the user press Ctrl + C, copy the text element's key to the clipboard:
+        this.listTextElements.KeyDown += (sender, e) =>
+        {
+            if (e is {Control: true, KeyCode: Keys.C})
+                this.buttonCopyKey.PerformClick();
+        };
     }
     
     // Loads all the text elements for the current section.
@@ -236,8 +243,11 @@ public partial class TextElements : UserControl
 
     private async void textBoxFilter_KeyUp(object sender, KeyEventArgs e) => await this.LoadTextElements();
 
-    private void buttonCopyKey_Click(object sender, EventArgs e)
+    private async void buttonCopyKey_Click(object sender, EventArgs e)
     {
-
+        if(this.DesignMode || this.currentTextElement is null)
+            return;
+        
+        Clipboard.SetText(await TextElementProcessor.GetKey(this.currentTextElement.Id));
     }
 }