WYSiWYG editor (tinyMCE v5.4) translates and if so where are its translation files?

@kriskoyk
You would have to download language and upload it into assets / tinymce and then change language in each generator.
Problem is this cannot be done automatically as not all languages exist

When you say generator what file is meant?

From the tinymce website the instructions say: In this example we will set the editor language to Swedish.

tinymce.init ({
   selector: 'textarea', // change this value according to your HTML
   language: 'sv_SE'
});

In which file is this code located?

@kriskoyk
Yes it is code that generate tinymce.
It can be in multiple, for admin and for front.

The question is where is this code, in which file?

The code " tinymce.init ({
   selector: 'textarea', // change this value according to your HTML
   language: 'sv_SE'
}); " for admin is here: oc-admin \ themes \ omega \ pages \ form or here: oc-admin \ themes \ modern \ pages \ form and the translation works properly. I can not find the file in the front section code to change the language there too.
  Any help?

Oc admin - depends on theme you use.
I do not quite remember front (not on pc), check oc-includes/osclass/ ... functions.php, utils.php or frm/item.form.php

Yes it is here: oc-includes \ osclass \ functions.php
It works very well.
Thanks for the help

Nice to hear that