How to enable translation in symfony for forms?

Question

symfony

I did everything according to the instructions.
app/config.yml file

framework:
    #esi:             ~
    translator:      { fallback: "%locale%" }
    secret:          "%secret%"
    router:
        resource: "%kernel.root_dir%/config/routing.yml"
        strict_requirements: ~
    form:            ~
    csrf_protection: ~
    validation:      { enable_annotations: true }
    templating:
        engines: ['twig']
        assets_version: 0.1a
    default_locale:  "%locale%"

The parameters.yml locale contains
locale: ru
My messages.ru.yml which is src/MyBundle/Resources/translations/messages.ru.yml

form:
    maker: Производитель
    category: Раздел

Form Generator

public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add(
                'maker',
                'entity',
                array(
                    'class' => 'MyBundle:ItemMaker',
                    'property' => 'name',
                    'empty_value' => '-- Все --'
                )
            )

        ->add(
        'category',
        'entity',
        array(
            'class' => 'MyBundleCategory',
            'property' => 'name',
            'empty_value' => '-- Все --'
        )
    );
    }

We check with a debugger:

I make a form output:

<div class="filterForm__fld">
                  
                    <div class="filterForm__fld__title">
                        {{ form_label(form.maker) }}
                    </div>

                        {{ form_widget(form.maker, { 'attr': {'class': 'select select_t1 w100p'} }) }}
                </div>
                <div class="filterForm__fld">
                    <div class="filterForm__fld__title">
                        {{ form_label(form.category) }}
                    </div>
                    {{ form_widget(form.category, { 'attr': {'class': 'select select_t1 w100p'} }) }}
                </div>

As a result, the labels {{ form_label(form.maker) }} are not translated, so the maker and category are displayed

Answer 1

do not make the "forms:" section in messages.ru.yml, put the translation directly as it is written on the page. You have maker and category fields in the form, and they are displayed on the page as Maker and Category. So?
Write in translation like this:

Maker: Создатель
Category: Категория

Well, if you want to add the form prefix, then add the label attribute to the form description:

$builder
        ->add(
            'maker',
            'entity',
            array(
                'label' => 'form.maker',
                'class' => 'MyBundle:ItemMaker',
                'property' => 'name',
                'empty_value' => '-- Все --'
            )
        )

        ->add(
            'category',
            'entity',
            array(
                'label' => 'form.category',
                'class' => 'MyBundleCategory',
                'property' => 'name',
                'empty_value' => '-- Все --'
            )
);

that is, specify the label in the same form as the framework sees it in the translation file. But then don't forget to add the English translation too! (if you need it)