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Problem:
The client is trying to translate attributes from English to other languages like French. They have already translated all attributes via the taxonomy translation and string translation tabs. However, the attributes in the 'Add existing' dropdown are displayed in English instead of French. After selecting an attribute, it then displays in the translated language.

Solution:
We recommend adding a custom filter to the theme's

functions.php

file to translate the attribute labels. Here are the steps to follow:

1. Open the

functions.php

file of your theme.
2. Insert the following code at the end of the file:

add_filter('woocommerce_attribute_taxonomies', 'testtranslateattributenew');<br />function testtranslateattributenew($found_product_categories){<br />    $my_current_lang = apply_filters('wpml_current_language', NULL);<br />    foreach ($found_product_categories as $key => $cat){<br />        $found_product_categories[$key]->attribute_label = apply_filters('wpml_translate_single_string', $cat->attribute_label, 'WordPress', 'taxonomy singular name: '. $cat->attribute_label , $my_current_lang );<br />    }<br />    return $found_product_categories;<br />}

3. Save the changes.
4. Go to 'Users > Profile' in your WordPress Dashboard.
5. Enable the option 'Set admin language as editing language.'
6. Update the changes.

After applying this code, create a product in the second language and check the Attribute dropdown. The translated attribute should now appear in the dropdown list in the correct language.

Please note that this solution might be outdated or not applicable to your case. If the issue persists, we highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If necessary, please open a new support ticket for further assistance.