Shows main culture first

I18N Commander/UI WinForms/Components/Translations.cs

@@ -24,8 +24,27 @@ public partial class Translations : UserControl
         if(this.DesignMode)
             return;
 
-        var cultureInfos = await AppSettings.GetCultureInfos();
-        foreach (var cultureInfo in cultureInfos.OrderByDescending(n => n.Index))
+        // Apply a custom order for the cultures. We want to show the default culture first,
+        // then the other cultures in order of their index. Please note: whatever we want to
+        // show as first, we have to return last!
+        async IAsyncEnumerable<AppSettings.CultureInfo> DesiredOrder()
+        {
+            // Get all configured cultures:
+            var cultureInfos = (await AppSettings.GetCultureInfos()).OrderByDescending(n => n.Index).ToList();
+            
+            // Get the main culture:
+            var mainCultureIndex = await AppSettings.GetDeepLSourceCultureIndex();
+            
+            // First, we return all the non-main cultures in descending order of their index:
+            foreach (var cultureInfo in cultureInfos.Where(n => n.Index != mainCultureIndex))
+                yield return cultureInfo;
+            
+            // Last, we return the main culture:
+            if(cultureInfos.Any(n => n.Index == mainCultureIndex))
+                yield return cultureInfos.First(n => n.Index == mainCultureIndex);
+        }
+
+        await foreach (var cultureInfo in DesiredOrder())
         {
             var translationComponent = new Translation(cultureInfo.Code);
             this.translationComponents.Add(cultureInfo.Code, translationComponent);