Using the Translator Accounts Add-on you can create or allow existing users to translate the site without admin rights.
The translators will be able to translate the website (directly from the front-end) without having to work with the WordPress back-end, site builders or metaboxes.
Translator Accounts Features:
Create a new user with the Translator role: WordPress -> Users -> Add New
Allow existing users to translate the website: WordPress -> Users -> Edit User -> TranslatePress Settings (or by changing their current role to the Translator role)