Ionic translate update


I have used TranslateLoader which works fine for the translations but I have a requirement of updating the translations timely which does not seems to be possible as the file is in assets folder and cannot access or overwrite them
I have written a customloader but then again the issue was the url where the json I have to download has to be a nativehttp call becuase the api call is again from external third party.

How do we conventionally update the translation.
Has anyone done it??
Any help will be appreciated.