Updated error messages

We've updated 404 not found error messages for the following endpoints:

Retrieve a journal

error message changed from Couldn't find Journal with 'id'="123" [WHERE "journals"."company_id" = $1]   to Couldn't find Journal with 'id'=123  

Get a ledger account

error message changed from Couldn't find PlanItem with 'id'="123" [WHERE "plan_items"."company_id" = $1]   to Couldn't find LedgerAccount with 'id'=123  

Update a ledger entry

error message changed from LedgerEntry not found   to Couldn't find LedgerEntry with 'id'=123  

List ledger entry lines of a Ledger Entry

error message changed from LedgerEntry not found  to Couldn't find LedgerEntry with 'id'=123  

Retrieve a Ledger entry line

error message changed from Couldn't find LedgerEvent with 'id'="123" [WHERE "ledger_events"."company_id" = $1]   to Couldn't find LedgerEntryLine with 'id'=123  

List ledger entry lines lettered to a given ledger entry line

error message changed from Couldn't find LedgerEvent with 'id'="123" [WHERE "ledger_events"."company_id" = $1]   to Couldn't find LedgerEntryLine with 'id'=123