Invalid encoding

When I want to upload an image from my computer to Facebook, I get a list of files on my computer in which, instead of letters, there are squares. What to do? In other cases, the encoding is normal. This began to happen after the next system update.I added a graphical environment Cynamon and Mate, it’s the same there

Quite vague your description and most likely related to fonts, not your DE.
noto-fonts-cjk is installed on your system? Do you use a particular system language?

sudo pacman -Rsnc noto-fonts-cjk
error: target not found: noto-fonts-cjk

After sudo localectl set-locale LANG=en_US.UTF-8 everything is all righ. Thanks