Please describe the problem:
Using search bar, can't find mails whose subjects contain some localized characters.

Steps to reproduce:
1. Invoke evolution on ja_JP.UTF-8.
2. Choose [File] -> [New] -> [Mail Message] and open [Compose a message].
3. Input the own mail address in To: field.
4. Input Japanese chars in Subject: field.
   e.g. Input Ctrl + Space and change the status to Kanji mode.
        Input 't', 'e', 's', 'u', 't', 'o'
        Input Space, Return key and then Japanese string; U+30C6, U+30B9 and
U+30C8 is determined.
5. Sent the email to myself.
6. Choose [Actions] -> [Send/Receive] and receive the mail.
7. Select [INBOX] icon in Folder pane.
8. Focus on [Subject contains] field and input the above string; U+30C6, U+30B9
and U+30C8 and Return key.


Actual results:
Then the mail cannot be found.

Expected results:
the corresponding mail can be found.

Does this happen every time?
Yes.

Other information:
This sometimes happens on Chinese and French too.