[AC-3230] Localizing Push Notification Alerts

Is there a way to localize Alerts push notifications. Someone suggested we keep the language of the User in ACS.User custom_fields, and then fetch the Users prefered language and send the Push Notification Alert text depending on that users language. While the above seems like a *very bad practice* (as it requires a lot of ACS calls just to send an Alert), I am wondering if there is a good practice to localize the Alert text in Push Notifications. *Apple Suggests* using:

"alert" : { 
    "loc-key" : "My Localized String",
    ...
}

And then, in your Localizable.strings file inside the correspondent language identifier, add the following: "My Localized String" = "The localized string in the language you want."; Ideally the same method would be used for Android.