Hello Dariusz

That's strange behavior.

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

Thank you, Dariusz

I can't find the reason why this is happening, so the ticket was forwarded to one of our developers. As soon as I hear from him, I will let you know.

Sorry for the delay.

Hi again Dariusz

Our developer simply logged in and created a new table on your website, and he could see the translation for predefined value for editing, and in the Edit modal:

Can you please check and let me know if it works now?

OK, Dariusz, thanks for the explanation.

So, edit doesn't show the correct translation, while adding a new row works fine.

I've forwarded the ticket to the developer again, so he can take a look. I will let you know as soon as I hear from him.

Hello again Dariusz.

This is a bug on our end, and it will be fixed in one of our next updates.

For the time being, please go to wpDataTables settings/Custom JS and CSS/ tab and disable the Minify option on the bottom of the page. Then, go to file wp-content/plugins/wpdatatables/assets/js/wpdatatables/wdt.columnFilter.js, and change line 828 from this:

var selectTitle = aoColumn.filterLabel ? aoColumn.filterLabel : '';

To this:

var selectTitle = aoColumn.filterLabel ? aoColumn.filterLabel : wpdatatables_frontend_strings.nothingSelected;

And also change line 990 from this:

var selectTitle = aoColumn.filterLabel ? aoColumn.filterLabel : '';

To this:

var selectTitle = aoColumn.filterLabel ? aoColumn.filterLabel : wpdatatables_frontend_strings.nothingSelected;

That should correct the behavior.

Ok, Dariusz, thanks for the update.

I informed our developer, and he'll check it again today. I'll let you know as soon as I hear from him.

Sorry for the delay.

Hello again Dariusz.

In a couple of places, in the edit modal and wpdatatables.js file, where the selectbox is being created, the placeholder was missing, so we changed that.

Please check again now, and let me know, but it should be fixed now.

Sorry for the delay.

I'm glad to hear that, Dariusz.

You're most welcome, and thanks for letting us know about this.