Store matadata in fastlane

[yurtpage]

The F-Droid store expects the app description to be in the /fastlane/android/en-US/. Then on the next release it will automatically pick the description.
But right now all the descriptions are in the /market folder.

I found that the fastlane/metadata/android is already used by the script https://github.com/dashpay/dash-wallet/blob/master/.deploy/prepare_changelog.sh
The script adds a new changelog record, same for Spanish which is not needed because it will anyway take it from the en-US locale.

So can we migrate to the fastlane structure and use static changelog files instead of generated?

Related: #19

[yurtpage]

The F-Droid fork of the wallet have the folder
https://github.com/HashEngineeringSolutions/dash-wallet/tree/master/fastlane/metadata/android/en-US