jQuery Datepicker Language
The QCF plugin uses a jQuery datepicker for the date field. The default language is English. WordPress should localize the datepicker but sometimes gets it wrong. If your dates aren’t showing in your language there are a couple of ways round the problem.
Adding a Localisation Script
Go to: Dashboard > Appearance > Editor
From the list on the right of your page find footer.php
Just before the </body> tag, enter the following:
The above code is for German. You will need to change the ‘de’ to your language code.
Or use this tool to get the code.
Tweaking the Datepicker
This is a bit more complex but if you have a jquery call in your theme you can add the line:
$.datepicker.setDefaults( $.datepicker.regional[ "fr" ] );
The above code is for French. You will need to change the ‘fr’ to your language code.
For more information on localizing the datepicker this is a good source:
I plan to add a localization option to the plugin at some point which makes all the above redundant.