How to create WordPress theme support for Cyrillic?

Travelify
1

Hello,
the slider doesn’t view Cyrillic header from the blog.
how to fix it?

Thank you!

2

Strange that it works elsewhere but doesn’t work inside slider.

You can fix it by simply adding the following lines to the WordPress Dashboard → Theme Options → Other → Custom CSS

.featured-text .featured-title {
  font:  28px 'Helvetica', sans-serif;
}
3

Now it works well. Thank you!