Add option to enable or disable global tags per projects

app/Locale/zh_CN/translations.php

@@ -838,7 +838,7 @@ return array(
     'Remove group' => '删除用户组',
     'Group removed successfully.' => '用户组已删除',
     'Unable to remove this group.' => '无法删除该用户组',
-    // 'Group membership(s):' => ':',
+    // 'Group membership(s):' => '',
     'Project Permissions' => '项目权限',
     'Manager' => '管理员',
     'Project Manager' => '项目管理员',
@@ -1416,4 +1416,5 @@ return array(
     // 'Task limit: ' => '',
     // 'Change to global tag' => '',
     // 'Do you really want to make the tag "%s" global?' => '',
+    // 'Enable global tags for this project' => '',
 );