Truncate with multibyte character

I'm working on version 1.8.3.
My language is Japanese, I have trouble with Truncate tag.
When I use Trancate with Japanese, a last character is garbled. (not always, but often)

So I tried this:

strlen -> mb_strlen (Line:16)
substr -> mb_substr (Line:17)

but nothing changed :(

I post this issue here

Still no answer. Please help.

Answered by Jason Varga!
>>>>>>> Answered <<<<<<<
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