#808 Yet another fix for the history tab in Nihongo mode

[naoki iimura]

Since the 'shorten__' subroutine in UI/HTML.pm does not consider about the
multi-byte texts, Japanese texts might be cut between the first and second
byte of a character.

When the From, To or Cc headers contains wrong character as euc-jp, the
history table can be showed incollectly.
(I've fixed the problem for the Subject header before, but From, To and Cc
headers have the same problem.)

This patch will correct these problems.

Naoki

[naoki iimura]

Patch for UI/HTML.pm

[naoki iimura]

Logged In: YES
user_id=372164
Originator: YES

Fixed.