BA Event plugin is ready for localization via .po/.mo files. The ba-event.pot file is included in plugin’s languages sub-directory. New translation files must have names like “ba-event-en_EN.po, ba-event-en_EN.mo” (change “en_EN” to your language code). Please find more information about WordPress plugins localization.
If you use qTranslate-X plugin, the languages will be automatically set. BA Event plugin contains configuration file (i18n-config.json) in the plugin root folder.