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The FacetWP Polylang Add-On (often bundled within the “Multilingual” add-on) is an essential bridge for websites that need to combine advanced faceted filtering with a multilingual setup. Without it, FacetWP may struggle to “see” which content belongs to which language, leading to mixed results or broken filters.

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  • Last Updated: 2020-09-12
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Core Specifications

  • Plugin Name: FacetWP Multilingual (supports both Polylang and WPML)

  • Current Version: ~1.0.1 (as of early 2026)

  • Requirements: * FacetWP 4.0+ (Recommended)

    • Polylang (Free or Pro)

    • PHP 7.4+ (to match FacetWP core requirements)

  • License: Included with both FacetWP Basic and Professional plans.

Key Features & Functionality

The add-on doesn’t just “translate” the filters; it changes how FacetWP interacts with the database to ensure language-specific accuracy.

  • Language-Aware Indexing: When you re-index, the add-on ensures that posts are associated with their specific Polylang language code.

  • Accurate Facet Counts: It dynamically updates the numbers next to your filters (e.g., Blue (5)) to reflect only the items available in the currently active language.

  • UI String Translation: It allows you to translate “in-database” strings that Polylang’s standard string translation might miss, such as facet labels, placeholder text, and “See More” buttons.

  • AJAX Synchronization: When a user switches languages, the AJAX-powered filters automatically refresh to point to the correct translated content without a full page reload.

Implementation Requirements

To get the most out of this integration, your WordPress setup must follow these rules:

Feature Requirement
Post Types Must be set to “Only show translated items” in Polylang settings.
Taxonomies Every category/tag used in a facet must have a translation in every active language.
URL Structure Supports sub-directories (/fr/) and sub-domains (fr.site.com), but generally does not support the ?lang=fr URL parameter.
Fallback Content Using “Fallback to default language” is discouraged as it causes duplicate terms to appear in facets.

Technical Tip: The facetwp_i18n Hook

For developers, the add-on works closely with the facetwp_i18n filter. If you have unique UI strings that aren’t showing up in Polylang’s string translation, you can manually map them in your functions.php:

PHP

add_filter( 'facetwp_i18n', function( $string ) {
    if ( isset( FWP()->facet->http_params['lang'] ) ) {
        $lang = FWP()->facet->http_params['lang'];
        // Example: Translate "Color" to French "Couleur"
        if ( 'fr' == $lang && 'Color' == $string ) {
            return 'Couleur';
        }
    }
    return $string;
});

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