[ticket/12143] Add group helper class to translate groupnames

We can translate groupnames now even though these groups aren't special

PHPBB3-12143

phpBB/config/default/container/services.yml

@@ -113,6 +113,11 @@ services:
     file_downloader:
         class: phpbb\file_downloader
 
+    group_helper:
+        class: phpbb\group\helper
+        arguments:
+            - @language
+
     log:
         class: phpbb\log\log
         arguments:

phpBB/phpbb/group/helper.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\group;
+
+class helper
+{
+	/** @var  \phpbb\language\language */
+	protected $language;
+
+	/**
+	 * Constructor
+	 *
+	 * @param \phpbb\language\language $language	Language object
+	 */
+	public function __construct(\phpbb\language\language $language)
+	{
+		$this->language = $language;
+	}
+
+	/**
+	 * @param $group_name string	The stored group name
+	 *
+	 * @return string		Group name or translated group name if it exists
+	 */
+	public function get_name($group_name)
+	{
+		return $this->language->is_set('G_' . utf8_strtoupper($group_name)) ? $this->language->lang('G_' . utf8_strtoupper($group_name)) : $group_name;
+	}
+}