UI strings should be localizable

[1ec5]

Strings that appear in UI built into the Android SDK should be localizable in order to match the user’s system and the surrounding application UI. This file contains several strings that appear in UI. Perhaps we can manage translations in Transifex, where we’re currently managing translations of the iOS and macOS SDKs.

/cc @zugaldia @tobrun @ragaisis

[tobrun]

Suggesting to pick up accessibility support in #4857 first to avoid doing double translation work.

[1ec5]

#8556 should’ve implemented the necessary Transifex integration, but we’ll want to do a tx pull -a before the next release to pull in any new translations.