How to change locale of xfce4-terminal window?

I need to record a gif (using peek) of copy/paste for my project. But I want the interface to be English. I was able to do this once, I've added env LC_ALL=C exo-open --launch TerminalEmulator in Launcher to change the locale of the terminal interface. But then I was not able to get it back to my normal locale UTF8.pl_PL. I was asking chatGPT and used this command:

exo-open --launch TerminalEmulator --command='unset LC_ALL && xfce4-terminal'

The command did not give any output but then I deleted the --command I get back my locale. But now I can't make it English again. Running this in terminal

LC_ALL=C && xfce4-terminal

Doesn't work. I also tried:

localectl set-locale LC_MESSAGES=en_US.utf8
localectl set-locale LANG=en_US.utf8

But the interface is still in my default locale. So how I should change the terminal interface locale to English and back to original locale (without rebooting)? I use Fedora Xfce.