Translating custom meta fields + import categories

[Lockoloop]

Hi,
So I have two tiny problems with the plug-in:

• first, exporting and importing the products CSV means that I end up with a new category for every product I reimported (if I update 10 products of the Spices & Herbs category, then I end up with 10 categories called Spices & Herbs): my website is in English and Dutch, I tried importing the CSV using the English category name, the Dutch name, and [:en]/[:nl] tags, and it happens in every case.
• second, I created some custom meta fields for my products (such as ingredients, storage, usage etc.), and they display correctly in both languages if I import everything from a CSV using the [:en]/[:nl] tags, but as soon as I edit them in Woocommerce product page, the new value overwrites both languages.
  I guess this might have to do with the way I save out the meta fields, but I haven't been able to figure out how to do it so it works:

<?php

// Create additional info Tab
add_filter('woocommerce_product_data_tabs', 'LCLPC_additional_product_settings_tabs');
function LCLPC_additional_product_settings_tabs($tabs)
{
    $tabs['additionnal'] = array(
        'label'    => 'Additional info',
        'target'   => 'additional_product_data',
        'class' => ['hide_if_external'],
        'priority' => 21
    );
    return $tabs;
}

// Additional info Tab content in back-end
add_action('woocommerce_product_data_panels', 'additional_product_panels');
function additional_product_panels()
{
    echo '<div id="additional_product_data" class="panel woocommerce_options_panel hidden">';
	
    woocommerce_wp_textarea_input(array(
        'id'          => 'usage',
        'value'       => get_post_meta(get_the_ID(), 'usage', true),
        'label'       => 'Usage',
    ));
	
    woocommerce_wp_textarea_input(array(
        'id'          => 'storage',
        'value'       => get_post_meta(get_the_ID(), 'storage', true),
        'label'       => 'Storage',
    ));
    woocommerce_wp_text_input(array(
        'id'          => 'allergens',
        'value'       => get_post_meta(get_the_ID(), 'allergens', true),
        'label'       => 'Allergen warnings',
    ));
	
    woocommerce_wp_textarea_input(array(
        'id'          => 'ingredients',
        'value'       => get_post_meta(get_the_ID(), 'ingredients', true),
        'label'       => 'Ingredients',
    ));

    woocommerce_wp_text_input(array(
        'id'          => 'supplier',
        'value'       => get_post_meta(get_the_ID(), 'supplier', true),
        'label'       => 'Supplier',
    ));

    woocommerce_wp_text_input(array(
        'id'          => 'origin',
        'value'       => get_post_meta(get_the_ID(), 'origin', true),
        'label'       => 'Origin',
    ));

    echo '</div>';
}

//Save
 add_action('woocommerce_process_product_meta', function ($post_id) {
    $product = wc_get_product($post_id);
    $product->update_meta_data('usage', sanitize_text_field($_POST['usage']));
	$product->update_meta_data('ingredients', sanitize_text_field($_POST['ingredients']));
	$product->update_meta_data('allergens', sanitize_text_field($_POST['allergens']));
    $product->update_meta_data('supplier', sanitize_text_field($_POST['supplier']));
    $product->update_meta_data('storage', sanitize_text_field($_POST['storage']));
    $product->update_meta_data('origin', sanitize_text_field($_POST['origin']));

    $product->save();
});

Thank you!