add global search

resources/lang/zh_CN/search.php

@@ -0,0 +1,13 @@
+<?php
+
+return [
+    'global_search' => '全站搜索',
+    'search_keyword' => '关键字',
+    'search_area' => '范围',
+    'search_area_options' => [
+        '0' => '标题',
+        '1' => '简介',
+        '3' => '发布者',
+        '4' => 'IMDB链接'
+    ],
+];