As of March 2nd, 2020, the Instagram platform will be deprecating its API. This will directly affect the Instagram feed section in all WordPress & Shopify themes. Read more on how it affects your theme here: https://fuelthemes.net/important-notice-instagram-feed-removal/

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How can I translate Product Filter plugin?

You can find the documentation and the necessary PO files inside: http://cl.ly/2l3e3c3L0U2k