Hi,

You should try to create translation file for your language and to translate theme labels. Use poedit software https://poedit.net/, load translation file from theme folder / languages, translate it, and name it according to WP Codex https://make.wordpress.org/polyglots/teams/

Helpful reading http://code.tutsplus.com/tutorials/translating-your-theme--wp-25014 - point regarding poedit

In case that you need to create new translation from scratch, please follow instructions from the following link http://www.gsy-design.com/how-to-generate-a-pot-file-using-poedit/ it is straightforward process.

Hello,

You can try to change that label for Month, by performing following steps:

Open modules.js file located in your theme folder/assets/js/modules.js and find function eltdfInitCountdown and in that function find call to countdown method and add labels1 attribute like this: https://www.screencast.com/t/fYOmaP5vCA

Here is the code below: https://www.screencast.com/t/ZZgonQXZU5MT

//Initialize countdown
                if(month-1===0){
                    countdown.countdown({
                        until: new Date( year, month - 1,day, hour, minute, 44),
                        labels: ['Years', 'Months', 'Weeks', dayLabel, hourLabel, minuteLabel, secondLabel],
                        labels1: ['Years', 'Months', 'Weeks', dayLabel, hourLabel, minuteLabel, secondLabel],
                        format: 'DHMS',
                        timezone: timezone,
                        padZeroes: true,
                        onTick: setCountdownStyle
                    });
                }
                else {
                    countdown.countdown({
                        until: new Date(year, month - 1, day, hour, minute, 44),
                        labels: ['Years', monthLabel, 'Weeks', dayLabel, hourLabel, minuteLabel, secondLabel],
                        labels1: ['Years', 'Meseci', 'Weeks', dayLabel, hourLabel, minuteLabel, secondLabel],
                        format: 'ODHMS',
                        timezone: timezone,
                        padZeroes: true,
                        onTick: setCountdownStyle
                    });
                }

so, adjust labels1 labels and than minify that file using some tool like this: http://jscompress.com/ and name that file as modules.min.js and save it to same folder to overwrite existing file.

Hope this will help.