AnkiMobile interface language
AnkiMobile's interface has been translated into a few different languages. Your iOS settings control which language AnkiMobile will appear in.
When the wrong language is shown
Please go to the iOS Settings app → General → Language & Region. In that section, you can specify the languages you prefer. If you want English to be used in AnkiMobile, please ensure English is listed above the language you don't want to see. If your native language is not English, you can put your native language first.
If you are on iOS 13, you can also control the language on a per-app basis. For example, if you want all apps on your device to appear in Chinese, but want Anki to show in English, you can do this by going to the Settings app. Locate Anki in the list of applications at the bottom, and you can then choose the language Anki should use.
If you would like to help translate AnkiMobile into another language, please see https://apps.ankiweb.net/docs/am-manual.html#translating-ankimobile