i think you have to set it in the options:
$(".form_datetime").datetimepicker({
isRTL: false,
format: 'dd.mm.yyyy hh:ii',
autoclose:true,
language: 'ru'
});
if its not working, be sure that:
$.fn.datetimepicker.dates['en'] = {
days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"],
daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
today: "Today"
};
is defined for 'ru'