From last couple of days my YouTube website language changed to Ukrainian and I had no idea how it changed. More over earlier language change option used to be on top left but now with redesign of YouTube, they have changed the placement.
This post is dedicated to all those people like me whose language is changed on YouTube and they are looking forward to revert back to English or any other language.
In new YouTube, you can change language at the bottom of the page. Simple click on the language and you can select your preferred language for YouTube.
I hope this will help users whose YouTube language is changed. Also if like YouTube, you might like to read:
Top 5 Websites to Download YouTube videos.