feat: add fastlane app description

[yurtpage]

trafficstars

The Fastlane allows to publish an app description for both PlayStore and F-Droid. The description can be internationalized.

Translation of the app description is very important because F-Droid doesn't even makes an auto translation.

Please integrate the app with the Weblate or Transifex and add the App Metadata to translation. Here is a sample of Conversations app metadata translation via Weblate https://translate.codeberg.org/projects/conversations/app-store-metadata-conversations/

Meanwhile here I added one translation as a sample.

[moughxyz]

Will these be used automatically when uploading to Google Play as well? I think for now I'd like to avoid that since we treat Google Play GUI as the source of truth for desc and screenshots.

[yurtpage]

Only the fdroid takes the description automatically on a next app release. For the GP you have to run the Fastlane command

[yurtpage]

@moughxyz friendly remind on this