I'm a new user of elementary and don't know anything about linux (I wanted to use an other system than windows bcause it wiped a partition and corrupted my hard drive during an update). So I just follow little tutorials from the ubuntu community without asking too many questions, but i ran into an issue (and it's completly my fault, sorry).
I wanted to change the theme to a dark theme and discovered tweaks. Then I installed it (https://techsphinx.com/linux/install-elementary-tweaks/) And on the gnome looks website I downloaded a macOS theme to match the OS. Everything worked fine, so I thought "let's install an icon pack" (very bad idea for a non experimented guy like me).
I googled how to install an icon pack and it says to extract the pack in to /usr/share/icons/ and to select it in the settings, but when I had done that every icon disapeared and the settings won't open, I can't delete the pack: I tried "sudo rmdir /usr/share/icons/McMojave-circle-black-dark" and the terminal says rmdir: impossible de supprimer 'McMojave-circle-black-dark/': Le dossier n'est pas vide, it's obviously in frensh because my system is in frensh and says something like "rmdir: impossible to remove 'McMojave-circle-black-dark/': The folder is not empty" I know that it's not empty, that is the reason why i want to remove it !!!
Thank you for any help.