Fix EUR formatting

lib/invoice/cli.py

@@ -179,11 +179,16 @@ class Application:
 
             log.debug("Creating TeX invoice...")
             self._check_path(self.tmp_path)
+
+            format_decimal=lambda x: '{:20,.2f}'.format(x).replace(',', '\\,').replace('.', ',')
+            format_eur=lambda x: format_decimal(x) + ' EUR'
+
             result = tempita.Template(open(tex_template).read()).substitute(
                 invoice=invoice_data,
                 issuer=issuer_data,
                 customer=customer_data,
-                eur=lambda x: '{:20,.2f} EUR'.format(x).replace(',', '\\,').replace('.', ','))
+                decimal=format_decimal,
+                eur=format_eur)
             open(tex_file, "w").write(str(result))
             assert(os.path.exists(tex_file))