Reviewing this, I suddenly realise that adding pluralisation might break existing use. And indeed - the [order_article form](https://github.com/wvengen/foodsoft/blob/b30b424540524b255e04c9a4a5d3986dc46cc025/app/views/order_articles/_edit.html.haml#L10) now shows the singular for the label, which is confusing. I've opened plataformatec/simple_form#974, and in the meantime we might workaround it by passing pluralised labels manually to applicable form inputs. What do you think?