Add the link to the reservation conditions to the booking form

This text must be created in the administration interface, but whatever.

web/templates/public/booking.gohtml

@@ -147,7 +147,7 @@
                     <label>
                         <input type="checkbox" required name="{{ .Name }}" {{ if .Checked}}checked{{ end }}
                                 {{ template "error-attrs" . }}
-                        > {{( pgettext "I have read and I accept the reservation conditions" "input" )}}</label><br>
+                        > {{ printf ( pgettext "I have read and I accept <a href=\"%s\" target=\"_blank\">the reservation conditions</a>" "input" ) (print "/" currentLocale "/legal/reservation") | raw }}</label><br>
                     {{ template "error-message" . }}
                 {{- end }}
             </fieldset>