Change php default_charset to UTF-8

Hello and thanks for the great software! I decided to switch to iRed last week and I really enjoy it until now.

I only want to sort one thing out at the moment.
Php configuration (/etc/php5/fpm/php.ini) has no value for default_charset.
The line is commented out like this:
;default_charset = "UTF-8"

Is it safe for ired to enable this and set default_charset to UTF-8 ?

I am willing to combine ired with owncloud, and owncloud kinda needs this to work properly.

Thanks!

==== Required information ====
- iRedMail version:  0.9
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Linux/BSD distribution name and version: Debian
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