If you need to change the language on your Amazon Prime Video account, simply head to the Prime Video website. Now, open the Accounts and Settings page and click on the Language tab. Here, you can select your desired language from the list.
Alternatively, if you do not use the Prime Video website in your country (some countries like the UK do not) head over to Amazon’s main website instead. Once there, hover your cursor over Account & Lists and click Your Prime Video. Now, click the gear icon in the top right of the screen. Choose Settings and then Language. Here you can pick from a list of available languages.