Hello Kor,
For my part i did exactly what is shownig in video, this is not my first time translating WP, via Poedit, it Wordked perfectly at first but then when i added new posts it goes back to english language knowing that the audience for the site is from Belgium so French spoken, and even with translated .po files and update GD => Multilocations => Translate country, after inserting new posts it goes back to english,
So now i have posts in French and new posts in english and this problem concerne only the country part,
please see attached file and thank you for your support.