Check and show a delete button if an invoice file is present
Add some bottom margin to button groups
Handle delete requests for invoices
Merge branch 'feature/4235ef-force-invoice-regeneration' into development (closes: #4235ef)
Bump version to 1.8
Update the changelog for the new release
Merge branch 'release/1.8'
Merge tag 'v1.8' into development

Release 1.8