API - init email template for email and password changes (WIP)

fittrackee/emails/templates/password_change/en/body.txt

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+Hi {{username}},
+
+The password for your FitTrackee account has been changed.
+
+For security, this request was received from a {{operating_system}} device using {{browser_name}}.
+If this password change wasn't initiated by you, please change your password immediately or contact your administrator if your account is locked.
+
+Thanks,
+The FitTrackee Team
+{{fittrackee_url}}