wfb
At the moment, the date/time show in the event section is date of event start not the publish post, you need to add the event start date and end date in the custom field section.
See the screenshot: http://prntscr.com/ma0u2v
The month name will change when you change the language in the WordPress, if you want to change the "When" word, you can use the Loco Translate plugin to change this word or find in the plugins/gk-nsp/article_wrappers/events/helper.php file (line 22).
Note: You should use loco translate plugin to transalte the plugin/theme into your language.
Hope this helps!
Regards,