Doesn't work with cyrillic fonts

Attached:
1. File recorded from the admin panel admin_labels.txt
2. File recorded directly (online now "Копка" ) cyrillic_labels.txt

please try this example file :
www.dropbox.com/s/a6p7blavif2b7wl/labels.txt?dl=0
tested by my side it works, encoded UTF8 with BOM

I downloaded the file.
Added it to the hosting.
In notepad ++ added url images and youtube
Outputs: "От производителя! Без посредников! Очень выгодно"

In file .htaccess
have a record:
AddDefaultCharset UTF-8

you can use my labels.txt file directly with a new module, using the demo slides
just put it in
media\com_sliderck\images\slides
without opening nor saving it

tell me if it works

for the htacess file, I don't know

Placed file labels.txt in folder media\com_sliderck\images\slides
Test page
kolodec-pod-kluch.konstantin-komarov.ru/sliderck
Cyrillic displayed.

He began to edit.
Opened the panel. There is no text.
I typed the text.
Text saved as "?????".

I downloaded the file after editing. after_editing_labels.txt

It is transcoded to UTF8 no BOM.