Hello, thanks for reaching out!
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1) First, ensure your iPhone or iPad has multiple languages installed. To do so, head to Settings > General > Language & Region. Tap “Other Languages” and add a language you want to use.
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Note: You don’t have to switch to the new language—just add it to this list.
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2) Next, head to the main Settings screen and scroll down until you see an alphabetical list of installed apps. Tap the app you want to modify language settings for.
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3) You’ll see a “Language” option under Preferred Language. Tap it and select the language you want to use for that app.