That’s because he forgot something in code.
Here is the correction to patch (don’t forget , at the end of the line!)
{label = _U('unpaid_bills'), value = 'unpaid_bills'}, -- don't forget the , !!!!!
{label = _U('Mettre en prison Fédérale'), value ='federal'}
Instead of
{label = _U('unpaid_bills'), value = 'unpaid_bills')
{label = ('Mettre en prison Fédérale'), value ='federal'}
Then add your translation in /location on any line with :
['Mettre en prison Fédérale'] = 'your menu translation',
Should works!