Text field throws a tinyMCE error due to changed language on site, help!

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I use Classified ads theme (called Listivo). There is an option for user to add their own classified ads there.

But recently the text editor for ads description started throwing the following error: Failed to load plugin url: [https://www.MY-DOMAIN.com/wp-includes/js/tinymce/langs/hr.js])

Here is a visual representation of an issue:
[https://ibb.co/SJZWbJx])

As I researched, it is due to changing the site language from English to my own (Croatian). But I can’t get it to work/remove the issue. Only when I switch back to English (I’m talking about WordPress core strings, not the themes or plugins languages), then it works.

I tried leaving the English language as a primary on site, but translating only these few strings I really need in Croatian (visible in UI) with Loco Translate. But no luck. I created new languages inside the WordPress file, copied the original (from System) to Custom (save it in the author’s folder) but it still shows the English version.

Can someone please help me out here?

Thank you!

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