Change admin directory

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In theory: you open index.php and edit $admin_relative and $lang_relative.
In practise: you check every single file and change all the references to the admin directory.

At some point we hope to only use variables for the admin path, but that’s currently not the case so there is no easy way to change it. You might also want to ask yourself why you want to change it in the first place, it’s often completely unnecessary to change the admin path given your server is somewhat secure and you have chosen a strong password.