Fix spelling as suggested by @rmbleeker (#8934)

Author: guillep2k

options/locale/locale_en-US.ini

@@ -1712,7 +1712,7 @@ users.auth_login_name = Authentication Sign-In Name
 users.password_helper = Leave the password empty to keep it unchanged.
 users.update_profile_success = The user account has been updated.
 users.edit_account = Edit User Account
-users.max_repo_creation = Maximal Number of Repositories
+users.max_repo_creation = Maximum Number of Repositories
 users.max_repo_creation_desc = (Enter -1 to use the global default limit.)
 users.is_activated = User Account Is Activated
 users.prohibit_login = Disable Sign-In