Do not use download accelerator to download translations. It will get error.
Translations Login as User
This plugin helps admin users to login to the front-end as a specific user. It is useful for websites where the admin user needs to check if a user can see their order(s) correctly, if a form was filled out correctly, or any issues with a user's personal details, etc. The Admin user will be accessing all this information as the external User in order to replicate any issues and assist the user.
Available Translations Login as User