Add file_ext optional parameter to further customize file searching process:
file_ext— Custom file extension to use when searching for translation files (without leading dot). By default, the extension is inferred from the file_format value. However, for certain formats (e.g.,json_structured), the downloaded files may still have a generic extension (e.g.,.json). In such cases, this parameter allows specifying the correct extension manually to ensure proper file matching. This parameter has no effect when thename_patternis provided.