Since “System Accounts” are globally used Accounting terms, they are not translatable.
We don’t recommend you modifying this from the code.
But you can do this following:
You will need to do a fresh WordPress installation on your site and then go to your cpanel and in your database file you will have to modify the “wp_erp_ac_chart_types” table
Here’s the location of the file that you also need to modify: modules\accounting\includes class-install.php
I hope this will help you out.