If you want to change your accounts default language, go to the setting of your account:

If the account is in English go to: Settings>App Settings
If the account is in Spanish go to: Ajustes>Ajustes de Cuenta
If the account is in Portuguese go to: Configurações>Conta

Then you can chose your preferred language and press Save

ES: Español
EN: Inglés
PT: Portugués

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