First code for liabilities and some tests.

resources/lang/en_US/firefly.php

@@ -700,6 +700,7 @@ return [
     'revenue_accounts'                        => 'Revenue accounts',
     'cash_accounts'                           => 'Cash accounts',
     'Cash account'                            => 'Cash account',
+    'liabilities_accounts'                    => 'Liabilities',
     'reconcile_account'                       => 'Reconcile account ":account"',
     'overview_of_reconcile_modal'             => 'Overview of reconciliation',
     'delete_reconciliation'                   => 'Delete reconciliation',
@@ -1187,6 +1188,10 @@ return [
     'no_accounts_intro_revenue'             => 'You have no revenue accounts yet. Revenue accounts are the places where you receive money from, such as your employer.',
     'no_accounts_imperative_revenue'        => 'Revenue accounts are created automatically when you create transactions, but you can create one manually too, if you want. Let\'s create one now:',
     'no_accounts_create_revenue'            => 'Create a revenue account',
+    'no_accounts_title_liabilities'         => 'Let\'s create a liability!',
+    'no_accounts_intro_liabilities'         => 'You have no liabilities yet. Liabilities are the accounts that register your credit card(s), (student) loans and other debts.',
+    'no_accounts_imperative_liabilities'    => 'You don\'t have to use this feature, but it can be useful if you want to keep track of these things.',
+    'no_accounts_create_liabilities'        => 'Create a liability',
     'no_budgets_title_default'              => 'Let\'s create a budget',
     'no_budgets_intro_default'              => 'You have no budgets yet. Budgets are used to organise your expenses into logical groups, which you can give a soft-cap to limit your expenses.',
     'no_budgets_imperative_default'         => 'Budgets are the basic tools of financial management. Let\'s create one now:',