MIDI: Allow selecting a directory for SC-55 ROMs

MIDI: Reflect ROM set install state in setup button label

MIDI: Link File_Extractor framework to main target

Translations: Add new localizable strings

Playlist: Localize status tooltip strings

Translations: Delete stale former translations

About Dialog: Default to English credits

About Dialog: Fix crash on unsupported languages

MIDI: Add .json to supported SoundFont List files

Added Spanish translation for Last.fm strings

lastfm: Update to production Keychain service name

Fix scrobbler sending duration in ms

Fix build errors in Last.FM and preferences code

Fix review issues in Last.FM auth

Register Last.FM pane in preferences sidebar