Charlotte Mason advocated using the language learning method taught by François Gouin (the Series Method). Here are a couple links to articles or other information about that method.
Language Impact article about the Series Method
Gouin's The Art of Teaching and Studying Lessons
Gouin's A First Lesson in French
Videos about how to use Gouin's method
A quick idea of what Gouin's method looks like; suggests that it's good for working with young children.
And, not necessarily mentioning Gouin but Charlotte Mason-style foreign language instruction:
A Parent's Review Article "The Teaching of French"
A Parent's Review Article "Notes of Lessons": the first segment is on French narration.
Another Parent's Review Article titled "Notes of Lessons": one segment is notes on a German lesson.
A Parent's Review Article "On the Teaching of Modern Languages".
A Parent's Review Article "When and How to Begin Modern Languages".
Another Parent's Review Article "How to Learn a Language".
A fabulous blog post about using narration in foreign language learning by Amy in Peru.
