Improved the dialogs for local data sources and the Batch Processing assistant (#1096)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/LongExtensions.cs

@@ -6,6 +6,8 @@ public static class LongExtensions
 {
     private static readonly string[] COUNT_SUFFIXES = ["k", "M", "B", "T"];
 
+    private static readonly string[] SIZE_UNITS = ["B", "kB", "MB", "GB", "TB"];
+
     /// <summary>
     /// Formats a count so that large numbers stay readable: 1456 becomes 1.46k, 4512900 becomes 4.51M.
     /// </summary>
@@ -42,20 +44,31 @@ public static class LongExtensions
     public static string CompactCount(this int count) => ((long)count).CompactCount();
 
     /// <summary>
-    /// Formats the file size in a human-readable format.
+    /// Formats the file size in a human-readable format, e.g., 1.9 MB.
     /// </summary>
+    /// <remarks>
+    /// Like CompactCount, the decimal separator follows the culture of the active language plugin.
+    /// </remarks>
     /// <param name="sizeBytes">The size in bytes.</param>
     /// <returns>The formatted file size.</returns>
-    public static string FileSize(this long sizeBytes)
+    public static string FileSize(this long sizeBytes) => sizeBytes.FileSize(I18N.I.Culture);
+
+    /// <summary>
+    /// Formats the file size in a human-readable format, with the decimal separator of the given culture.
+    /// </summary>
+    /// <param name="sizeBytes">The size in bytes.</param>
+    /// <param name="culture">The culture whose decimal separator to use.</param>
+    /// <returns>The formatted file size.</returns>
+    internal static string FileSize(this long sizeBytes, IFormatProvider culture)
     {
-        string[] sizes = { "B", "kB", "MB", "GB", "TB" };
         var order = 0;
-        while (sizeBytes >= 1024 && order < sizes.Length - 1)
+        double size = sizeBytes;
+        while (size >= 1024 && order < SIZE_UNITS.Length - 1)
         {
             order++;
-            sizeBytes /= 1024;
+            size /= 1024;
         }
 
-        return $"{sizeBytes:0.##} {sizes[order]}";
+        return $"{size.ToString("0.##", culture)} {SIZE_UNITS[order]}";
     }
 }