Billing docs improvement + build opt

api/billing/documents/renderer/layout.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/jung-kurt/gofpdf"
+	"github.com/tech/sendico/billing/documents/internal/content"
 )
 
 const (
@@ -28,7 +29,7 @@ func (r Renderer) Render(blocks []Block, footerHash string) ([]byte, error) {
 	pdf.SetAutoPageBreak(true, pageMarginBottom)
 	pdf.SetCompression(false)
 	pdf.SetAuthor(r.Issuer.LegalName, false)
-	pdf.SetTitle("Act of Acceptance", false)
+	pdf.SetTitle(content.PDFTitleActOfAcceptance, false)
 
 	owner := strings.TrimSpace(r.OwnerPassword)
 	if owner != "" {
@@ -39,7 +40,7 @@ func (r Renderer) Render(blocks []Block, footerHash string) ([]byte, error) {
 		pdf.SetY(-15)
 		pdf.SetFont("Helvetica", "", 8)
 
-		footer := "Document integrity hash: " + footerHash
+		footer := content.DocumentIntegrityHashPrefix + footerHash
 		pdf.CellFormat(0, 5, footer, "", 0, "L", false, 0, "")
 	})