source/blender/editors/space_info/info_ops.cc

@@ -176,8 +176,14 @@ static int pack_all_invoke(bContext *C, wmOperator *op, const wmEvent * /*event*
   }
 
   if (ima) {
-    return WM_operator_confirm_message(
-        C, op, "Some images are painted on. These changes will be lost. Continue?");
+    return WM_operator_confirm_ex(
+        C,
+        op,
+        IFACE_("Pack all used external files into this .blend file"),
+        IFACE_("Warning: Some images are modified and these changes will be lost."),
+        IFACE_("Pack"),
+        ALERT_ICON_WARNING,
+        false);
   }
 
   return pack_all_exec(C, op);