To change the from- and/or the to-language in the Phrasebook please do the following:

• Go to Microsoft Translator
• Tap the Phrasebook icon. It’s the middle icon at the bottom of your screen 
• Tap one of the phrasebooks e.g. Essentials
• At the bottom of the screen you see the languages appear.
• To change the from-language tap the language to the left of the arrows and to change the to-language tap the language to the right of the arrows
• Tap the back button and all phrases will now be in the languages that you have chosen.