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To change Bookshelf language settings from the Sign In page/screen, select the English drop-down at the bottom right-hand side of the Sign-In screen.
Select your language from the menu.
Sign in to Bookshelf. Your menus will be in your chosen language.
From with Bookshelf
If you SSO into Bookshelf and are already signed in, you can change your language in the My Account profile either in the Library or in the Reader and selecting your language from the menu.
PLEASE NOTE: changing the language will not change the language of your textbooks.