Avoid empty preferred variant.

Author: Maikuolan

src/Loader.php

@@ -8,7 +8,7 @@
  * License: GNU/GPLv2
  * @see LICENSE.txt
  *
- * This file: The loader (last modified: 2024.07.13).
+ * This file: The loader (last modified: 2024.07.22).
  */
 
 namespace phpMussel\Core;
@@ -626,7 +626,7 @@ public function loadL10N(string $Path = ''): void
             $Try = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE'], 20);
             $Accepted = '';
             foreach ($Try as $Accepted) {
-                $Accepted = preg_replace(['~;.*$~', '~[^-A-Za-z]~'], '', $Accepted);
+                $Accepted = preg_replace(['~;.*$~', '~[^-A-Za-z]|-$~'], '', $Accepted);
                 $Primary = '';
                 $IsSameAs = false;
                 if ($this->L10NAccepted === $Accepted) {