SearchWP WPML Integration Extension
WPML is an awesome, long standing plugin that adds multilingual support to WordPress:
WPML makes it easy to build multilingual sites and run them.
It’s powerful enough for corporate sites, yet simple for blogs.
After installing and activating this SearchWP WPML Integration Extension, SearchWP will limit search results to the active language of your WPML-powered content segmentation.
This is an extension of SearchWP Plugin. As to use this extension, you need to first install SearchWP Plugin.