Bug-fix.

Changelog excerpt:
- Explicitly defining the region for the configured L10N where deferment
  may be available but the region for the corresponding listed
  configuration choice not included could've caused the L10N loader to
  simply use fallbacks instead; Fixed.

Author: Maikuolan

src/Loader.php

@@ -8,7 +8,7 @@
  * License: GNU/GPLv2
  * @see LICENSE.txt
  *
- * This file: The loader (last modified: 2023.04.04).
+ * This file: The loader (last modified: 2023.04.25).
  */
 
 namespace phpMussel\Core;
@@ -93,7 +93,7 @@ class Loader
     /**
      * @var string phpMussel version number (SemVer).
      */
-    public $ScriptVersion = '3.3.4';
+    public $ScriptVersion = '3.4.0';
 
     /**
      * @var string phpMussel version identifier (complete notation).
@@ -605,7 +605,15 @@ public function loadL10N(string $Path = ''): void
             $Primary = $this->readFile($Path . 'en.yml');
             $Fallback = '';
         } else {
-            $Primary = $this->readFile($Path . $this->Configuration['core']['lang'] . '.yml');
+            if (($Primary = $this->readFile($Path . $this->Configuration['core']['lang'] . '.yml')) === '') {
+                if (isset($this->ConfigurationDefaults['core']['lang']['defer'][$this->Configuration['core']['lang']])) {
+                    $Primary = $this->readFile($Path . $this->ConfigurationDefaults['core']['lang']['defer'][$this->Configuration['core']['lang']] . '.yml');
+                }
+                if ($Primary === '') {
+                    $Try = preg_replace('~-.*$~', '', $this->Configuration['core']['lang']);
+                    $Primary = $this->readFile($Path . $Try . '.yml');
+                }
+            }
             $Fallback = $this->readFile($Path . 'en.yml');
         }
         if ($Primary !== '') {