wp-includes/class-wp-locale-switcher.php:161Restores the translations according to the original locale.
string|false public function restore_current_locale() { if ( empty( $this->stack ) ) { return false; } $this->stack = array( array( $this->original_locale, false ) ); return $this->restore_previous_locale(); }Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-locale-switcher.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.