If you wish to change Fast Simon language, please do the following:
1. Go to Fast Simon dashboard
2. Click on "AutoComplete" tab, and choose the language on the "Titles language" setting.
3. Click on "Search Results" tab, and scroll down to "Search Results Filters" settings. Change the filter names.
Note: Fast Simon for Shopify integrates with Langify app, allowing you to translate your shop to any language while keeping all the search functionalities.