[Resolved] Woocommerce custom fields plugin - in english the custom fields are not displayed

Thank you for waiting on this.

I was able to make some progress but looks like plugin doesn't support much of the translations side. However, I still have some things to check and 'll get back to you accordingly by tomorrow.

Thank you for your patience and cooperation. I was able to find the solution, please consider following options. Although both are the same but there's a slight difference for understanding.

Option A
1. Set "Product Fields (wccf_product_field)" post type to Translatable in WPML -> Settings -> Post Types Translation (see attached). So you can add product fields in other languages.
2. Go to product fields.
3. Edit the field in default language (you can switch the language from top admin bar).
4. After setting #1, now you should have a "Language" section in the right sidebar (see attached). Click the + icon (for the first time) to add the translation of the field. This 'll open it in ATE but you'll be able to see only a label which you can translate. This is enough till now.
5. After completing the translation return back to the French version (default lang) of the product.
6. Go back to the fields listing page (i.e. Custom Fields -> Product Fields).
7. Switch to the English (secondary lang) from top admin bar and you should now see a field listed like "no label".
8. Open it for editing, add the conditions and other settings like the French version. However, notice that you should've translated the product attributes beforehand. So when you set the condition based on the product attributes, you 'll be able to search their English versions.
9. Save.
10. And it should work just fine in the frontend.

Option B
I think this option is much better than A, because in option A, if you use ATE for translation it creates a vague (random) number named field (point #7 above). So All the steps are same for this option B, except that don't translate the field with ATE.

But create one field in French and one field in English. I've also demonstrated this in the sandbox site:
- French: My New French Field
- English: My New English Field

This gives you the opportunity to name the fields properly, which may be a crucial requirement when dealing with custom orders later (instead of figuring out fields with no labels or vague/random numbers).

In any case, when you'll be editing the secondary language version of the field, WPML 'll warn you about it. Just ignore and click "Edit anyway" to edit the field as needed.

I've tried again in your site, even updated WPML plugins to latest versions (released in previous week), corrected WooCommerce Endpoints (need to be in English - a known issue) and then translated (regardless of site's default lang) and synchronized attributes.

But there's always this error in the logs (500 Internal Server Error), when selecting a choice from the 2nd field:

PHP Fatal error:  Uncaught Error: Call to undefined method WCCF_FB::radio-en() in /home/serveun/www/wp-content/plugins/woocommerce-custom-fields/classes/fields/field-controllers/wccf-field-controller.class.php:2049
Stack trace:
#0 /home/serveun/www/wp-content/plugins/woocommerce-custom-fields/classes/fields/field-controllers/wccf-field-controller.class.php(1926): WCCF_Field_Controller::print_field(Object(WCCF_Product_Field), NULL, 0, Object(WC_Product_Variation), Array)
#1 /home/serveun/www/wp-content/plugins/woocommerce-custom-fields/classes/wccf-wc-product.class.php(363): WCCF_Field_Controller::print_fields(Array, NULL, 1, NULL, Object(WC_Product_Variation))
#2 /home/serveun/www/wp-includes/class-wp-hook.php(324): WCCF_WC_Product->ajax_refresh_product_field_view('')
#3 /home/serveun/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#4 /home/serveun/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /home/serveun/www/wp-admin/admin-ajax.php(192): do_action('wp_ajax_wccf_re...')
#6 {main}
  thrown in /home/serveun/www/wp-content/plugins/woocommerce-custom-fields/classes/fields/field-controllers/wccf-field-controller.class.php on line 2049

Notice that this is the same error we found earlier but with less trace because now only a few plugins are active.

So I deleted one any only radio field, from the product fields, although it was disabled but still was being processed. I deleted it from Trash also. And now there's no 500 Internal Server Error at hidden link when changing field choices.

However, still the conditional fields are not being displayed but I guess that's a matter of some appropriate conditions and cleaning up the fields mess.

I'll recommend deleting all fields from all languages, including the Trash (for all languages). Then create 1 field first, follow the steps to translate and see if it works. Then add another, repeat the process and keep going.

I also noticed that even for default language version of the product, sometimes fields do not appear correctly. I suspect some caching may also be involved. So it is better to disable all caches and firewalls (plugins and/or server side) before testing the above mentioned.

You're always welcome. I tried my best.

Please feel free to close this ticket in this case and don't hesitate to open a new one whenever you need any help regarding WPML.

Have a great day 🙂