MRBS 1.12.2 等保2.0二级整改完整提交

包含：登录失败锁定、90天密码有效期、30分钟会话超时、
强制改密、登录审计日志、屏幕水印、企业背景图、
备案信息固定底部、favicon、JS空集合保护、
会话过期体验优化（403 JSON）、display_errors 关闭、
固定 key 根治 Integrity check failed 等全部改动

注意：config.inc.php/.htaccess/.user.ini 含敏感信息，
通过 .gitignore 排除，勿推送到公开仓库。

lib/MRBS/Intl/LocaleSwitcher.php

@@ -0,0 +1,54 @@
+<?php
+declare(strict_types=1);
+namespace MRBS\Intl;
+
+use MRBS\Language;
+use MRBS\System;
+
+class LocaleSwitcher
+{
+  private $category;
+  private $locale;
+  private $old_locale;
+
+
+  public function __construct(int $category, string $locale)
+  {
+    $this->category = $category;
+    $this->locale = $locale;
+  }
+
+
+  public function switch()
+  {
+    // It's not worth testing whether the new locale is the same as the old one, thereby saving us setting
+    // the locale again.  That's because setting the locale on Unix systems seems to be about 100 times
+    // faster than on Windows.  So on Unix systems, it's not worth worrying about.  And on Windows, we have
+    // to set the locale again anyway in case another script running in the same process has changed the
+    // locale since we first set it.  See the warning on the PHP manual page for setlocale():
+    //
+    // "The locale information is maintained per process, not per thread. If you are running PHP on a
+    // multithreaded server API like IIS or Apache on Windows, you may experience sudden changes in locale
+    // settings while a script is running, though the script itself never called setlocale(). This happens
+    // due to other scripts running in different threads of the same process at the same time, changing the
+    // process-wide locale using setlocale()."
+    $this->old_locale = setlocale($this->category, '0');
+    Language::setLocale($this->category, $this->locale);
+  }
+
+
+  public function restore()
+  {
+    if (!isset($this->old_locale))
+    {
+      throw new \RuntimeException("switch() must be called before restore().");
+    }
+
+    if (false === setlocale($this->category, $this->old_locale))
+    {
+      // Shouldn't happen as the old locale was what the system told us it was.
+      throw new \RuntimeException("Could not restore locale to '" . $this->old_locale . "'");
+    }
+  }
+
+}