This symbol don’t change anything. For example, now there’s symbol ‘U’. Media library doesn’t loading.
Again, except for the code above in the functions.php file – nothing. You can see it by yourself, FTP access is open, login details slightly above.

Hello! Thanx for youe anwers.

This is my functions.php of a child theme as is. This code just adds an additional currency, no more, and (as I understood) doesn’t replace the functions.php of main theme. Check it pls:

Trouble with media library still no changes.

And also see this page? trouble with long column, just visual but uncomfortable 4 editing.
10x

Now with the main theme image gallery the same thing 🙁

http://www.ledshop.in.ua

Sorry for my dummy questions, but I don’t understand what you mean saying “wp-admin panel credentials”.