'error.user_exists' => 'Korisnik pod ovim imenom već postoji.',
// TODO: translate the following.
// 'error.object_exists' => 'Object with this name already exists.',
-'error.client_exists' => 'Klijent pod ovim imenom već postoji.',
'error.invoice_exists' => 'Račun pod ovim brojem već postoji.',
// TODO: translate the following.
// 'error.role_exists' => 'Role with this rank already exists.',