Improve application metadata, fix app name

android/gradle.properties

fastlane/metadata/android/en-US/changelogs/50.txt

fastlane/metadata/android/en-US/full_description.txt

fastlane/metadata/android/en-US/short_description.txt

fastlane/metadata/android/en-US/title.txt

fastlane/metadata/android/fr-FR/changelogs/50.txt

fastlane/metadata/android/fr-FR/full_description.txt

fastlane/metadata/android/fr-FR/short_description.txt

fdroid_metadata.yml