[O] CUSTOM_ID property does not support Chinese

[stardiviner]

Here is the example:

#+begin_src org
* headline
  :CUSTOM_ID: 测试
#+end_src

I use org-store-link, and org-insert-link keybindings. But it reports error:

Position saved to mark ring, go back with ‘M-,’.
if: No match for custom ID: 
%E5%AE%BD%E5%BA%A6%E4%BC%98%E5%85%88%E6%9C%89%E5%88%A9%E4%BA%8E%E5%A4%9A%E4%B8%AA%E7%88%AC%E8%99%AB%E5%8D%8F%E5%90%8C%E6%8A%93%E5%8F%96
Position saved to mark ring, go back with ‘M-,’.
if: No match for custom ID: 
%E5%AE%BD%E5%BA%A6%E4%BC%98%E5%85%88%E6%9C%89%E5%88%A9%E4%BA%8E%E5%A4%9A%E4%B8%AA%E7%88%AC%E8%99%AB%E5%8D%8F%E5%90%8C%E6%8A%93%E5%8F%96

Seems Org Mode can't handle Chinese correctly.

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[ stardiviner ]
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