Keep StoreLanguages up to date

[FyreByrd]

We recently had to make several updates to the StoreLanguages table after we found out it was out of sync with the current list supported by GooglePlay:

#1455, e5f0bbd, 93ee40d, 0d7c381

While Google does have publicly available documentation of which languages are available here, it does not match what is actually available in the console. We need to find a better long term solution.

[chrisvire]

I have done some research. It doesn't look that Google Play Developer API returns a list of languages that can be used.

[chrisvire]

I did find this in the Google APIs used by Fastlane. I am not sure how we could use it or whether it really gets ALL possible languages or only the languages that have been specified for an app.

https://github.com/googleapis/google-api-ruby-client/blob/163e88f8a56de2c325ee6d0bb1c54bb696a5bb0e/generated/google-apis-translate_v3beta1/lib/google/apis/translate_v3beta1/service.rb#L92

[FyreByrd]

It's at least a start. I was hoping we could do something similar to how we get the LDML lang tags.