Should I use which file system for Proton and Wine prefixes on Lutris or Steam with an external SSD or microSD card under SteamOS ?

In the Bazzite documentation says "FAT32 and exFAT are unsupported . Both filesystems do not support symbolic links which is required for Proton prefixes to work properly. However, there are scenarios where a microSD card is formatted to exFAT may work in some cases, but this method is unsupported as something the Bazzite maintainers do not plan to accommodate."

I installed Dino Crisis and Alice Madness Returns with a French setup, either on Steam Deck under SteamOS or PC under Windows (ISO FR). Once it's finished, I launch a game, I see that the game is in English, not in French. I tried adding LANG=fr_FR.UTF-8 %command% to "arguments in Lutris but that doesn't change anything. the same for Alice

I know that the games support different languages ​​like French, German, Italian, Japanese, Spanish and there are ways to change a language with an .ini file for Steam or .info for Gog but I don't know how to change a language with files with these two games

I have never installed a nix package on Steam Deck under SteamOS before. I followed his instructions from this website , everything is ok without problem, then I installed an app with this command nix-env -iA nixpkgs.mullvad-vpn. When I finish installing an app, I open Mullvad GUI, I see a message

Unable to contact the Mullvad system 
service, your connection might be unsecure. 
Please troubleshoot or send a problem 
report by clicking the "Learn more" button.  

I don't know how to fix this issue

My Nix version is 2.32.4 and my SteamOS version is 3.7.13

I installed Fedora 43 with this command distrobox create -i registry.fedoraproject.org/fedora:43 --init --additional-packages "systemd" -n test then I installed Mullvad VPN with these commands sudo dnf config-manager addrepo --from-repofile=https://repository.mullvad.net/rpm/stable/mullvad.repo and sudo dnf install mullvad-vpn. Once it's finished, I tried to type mullvad status but it gives an error message

Error: Management RPC server or client error  

Caused by:  
         0:   transport error  
         1:   No such file or directory (os error 2)  
         2:   No such file or directory (os error 2)  

How to solve this issue ? I just want to use mullvad-cli

How to uninstall this command ? ```
curl -L https://raw.githubusercontent.com/denis-g/steam-deck-optimization-guide/master/scripts/steamos_optimization.sh | sh.

Because I need to uninstall it on my Steam Deck because there is better than this command of A.B.T

I would like to know if it is possible to use an external controller instead of using the mouse/keyboard in desktop mode on Steam Deck?

I already have protection cases for my HDDs but I would like to have box suitcase to protect my HDDs like this one. Can you recommend which hdd storage box suitcase I should use ? I'm from Europe