Instant Search Widget
Navigate to Instant search widget → Translation and enter your translation into the provided fields. Do not forget to save the changes.
Search Results Widget
Navigate to Search results widget → Translation and enter your translation into the provided fields. Do not forget to save the changes.
Note: Search Results Widget available for Shopify and Magento(from 3.1.1) stores.
Filters
Switch to the Filters tab and click the Edit filters button. Next, enter your translation into the Title field. Do not forget to save the changes.