Minor fixes

* more fixes to sms parts counter on send_sms page: unicode message segment length is 67 symbols (134 bytes), not 63.
Proof link (http://en.wikipedia.org/wiki/Short_Message_Service#Message_size).
It's funny, when I type symbols in my phone, it shows remaining symbols and parts counter, and when parts counter becomes 2, remaining symbols shows 63, BUT first symbol in second part is already typed,if we count this one+63(remaining from part two)+70(already typed before)=134 and this is 2*67. Thus we can accidentally count wrong, because of remaining symbols counter. 67 (if total count more than 70) is true.
* more translation fixes on configuration pages, added gettext to translations already exists in language files but not used.
* fix mistype in russian translation.
* SMS polls: Fixed unicode legend descriptions (changed font because it has no cyrillic symbols).