增加多语言支持，修复 utf8mb4 乱码问题

更新版本到 7.3.3325

include/core/PHPMC/Lang.php

@@ -0,0 +1,22 @@
+<?php
+class Lang {
+	
+	public $lang;
+	public $data;
+	
+	public function setLang($lang) {
+		$this->lang = $lang;
+		if(file_exists(ROOT . "/include/langs/{$lang}.php")) {
+			include(ROOT . "/include/langs/{$lang}.php");
+			$this->data = $langdata;
+		} else {
+			$this->data = Array();
+		}
+	}
+	
+	public function str($text) {
+		$data = $this->data;
+		//file_put_contents(ROOT . "/lang.txt", "'{$text}' => '{$text}'", FILE_APPEND);
+		return isset($data[$text]) ? $data[$text] : $text;
+	}
+}