Move fileUploadErrorMessage from Admin\Backend to Basic

Also removed the auto translate, return just string.
Is also a static method so can be called by
Basic::fileUploadErrorMessage too

Removed left over LANG settings in admin header

www/includes/admin_header.php

@@ -13,7 +13,6 @@ if ($DEBUG_ALL && $ENABLE_ERROR_HANDLING) {
 	include BASE.LIBS."Error.Handling.php";
 }
 // predefine vars
-$LANG = '';
 $messages = array();
 // import all POST vars
 // extract($_POST, EXTR_SKIP);
@@ -50,10 +49,6 @@ if ($AJAX_PAGE && !$ZIP_STREAM) {
 //------------------------------ class init start
 // login & page access check
 $login = new CoreLibs\ACL\Login(DB_CONFIG);
-// post login lang check
-if (isset($_SESSION['DEFAULT_LANG'])) {
-	$LANG = $_SESSION['DEFAULT_LANG'];
-}
 // create smarty object
 $smarty = new CoreLibs\Template\SmartyExtend();
 // create new DB class

www/lib/CoreLibs/Admin/Backend.php

@@ -208,42 +208,6 @@ class Backend extends \CoreLibs\DB\IO
 		$this->dbExec($q, 'NULL');
 	}
 
-	/**
-	 * helper function for PHP file upload error messgaes to messge string
-	 * @param  int    $error_code integer _FILE upload error code
-	 * @return string                     message string, translated
-	 */
-	public function fileUploadErrorMessage(int $error_code): string
-	{
-		switch ($error_code) {
-			case UPLOAD_ERR_INI_SIZE:
-				$message = 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
-				break;
-			case UPLOAD_ERR_FORM_SIZE:
-				$message = 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
-				break;
-			case UPLOAD_ERR_PARTIAL:
-				$message = 'The uploaded file was only partially uploaded';
-				break;
-			case UPLOAD_ERR_NO_FILE:
-				$message = 'No file was uploaded';
-				break;
-			case UPLOAD_ERR_NO_TMP_DIR:
-				$message = 'Missing a temporary folder';
-				break;
-			case UPLOAD_ERR_CANT_WRITE:
-				$message = 'Failed to write file to disk';
-				break;
-			case UPLOAD_ERR_EXTENSION:
-				$message = 'File upload stopped by extension';
-				break;
-			default:
-				$message = 'Unknown upload error';
-				break;
-		}
-		return $this->l->__($message);
-	}
-
 	/**
 	 * menu creater (from login menu session pages)
 	 * @param  int $flag visible flag trigger

www/lib/CoreLibs/Basic.php

@@ -891,6 +891,42 @@ class Basic
 		return "<pre>".print_r($array, true)."</pre>";
 	}
 
+	/**
+	 * helper function for PHP file upload error messgaes to messge string
+	 * @param  int    $error_code integer _FILE upload error code
+	 * @return string                     message string, translated
+	 */
+	public function fileUploadErrorMessage(int $error_code): string
+	{
+		switch ($error_code) {
+			case UPLOAD_ERR_INI_SIZE:
+				$message = 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
+				break;
+			case UPLOAD_ERR_FORM_SIZE:
+				$message = 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
+				break;
+			case UPLOAD_ERR_PARTIAL:
+				$message = 'The uploaded file was only partially uploaded';
+				break;
+			case UPLOAD_ERR_NO_FILE:
+				$message = 'No file was uploaded';
+				break;
+			case UPLOAD_ERR_NO_TMP_DIR:
+				$message = 'Missing a temporary folder';
+				break;
+			case UPLOAD_ERR_CANT_WRITE:
+				$message = 'Failed to write file to disk';
+				break;
+			case UPLOAD_ERR_EXTENSION:
+				$message = 'File upload stopped by extension';
+				break;
+			default:
+				$message = 'Unknown upload error';
+				break;
+		}
+		return $message;
+	}
+
 	// ****** DEBUG/ERROR FUNCTIONS ******
 
 	// ****** RANDOM KEY GEN ******