Invoice labels now use Title Case

On the Invoices pages, labels such as buttons, column headers, status badges and totals now use Title Case, the same style used across Servinix. The features themselves work the same way.

Result / verify

1. Open Invoices.
2. Column headers, tabs and status badges read in Title Case, for example "Partially Paid".
3. Open an invoice. The totals read "Subtotal", "Total" and "Amount Paid".
4. The button for starting a new invoice reads "Create Invoice", and line-item types read "Material", "Labor" and "Other".
5. In Settings, the invoices page is titled "Invoice Setup".