Fixes #3254 add ability to override existing translation validation language in App

This reverts commit eeaa922.

Author: samsonasik

app/Language/en/Validation.php

@@ -0,0 +1,4 @@
+<?php
+
+// override core en language system validation or define your own en language validation message
+return [];

system/Language/Language.php

@@ -338,7 +338,16 @@ protected function load(string $file, string $locale, bool $return = false)
 	 */
 	protected function requireFile(string $path): array
 	{
-		$files   = Services::locator()->search($path);
+		$files = Services::locator()->search($path);
+		$files = array_merge(
+			array_filter($files, function ($value) {
+				return strpos($value, APPPATH) === false;
+			}),
+			array_filter($files, function ($value) {
+				return strpos($value, APPPATH) === 0;
+			})
+		);
+
 		$strings = [];
 
 		foreach ($files as $file)