Change of SM default_charset to UTF-8

Hi all,

  seeing that 3 more languages are going to switch to UTF-8 for SM 1.4.18, I'd like to propose to switch the SM's default_charset to UTF-8 as well.

The definition for it resides in config/config_default.php and I suggest to modify it as follows:

------------------

/**
 * Default Charset
 *
 * This option controls what character set is used when sending mail
 * and when sending HTML to the browser. By default it's set to 'utf-8',
 * which ensures that mail written in any charset could be handled correctly.
 *
 * This option is active *ONLY* when default language is en_US. In other
 * cases SquirrelMail uses charset that depends on default language.
 * See $squirrelmail_default_language
 *
 * If you're seeing any strange problems with UTF-8, you might try to set
 * the default charset to 'iso-8859-1'.
 * @global string $default_charset
 */
$default_charset = 'utf-8';

----------------------

The above change will have zero impact on existing installations, since this template file is used just for fetching defaults during first SM installation. 
Anyway, I do belive that setting this to UTF-8 is a good way to express our common preference for UTF-8 and initiate migration towards it.

What do you think?

Regards, MK

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