Blockers for first release

[bertob]

• Redesign download dialog
  • add close button
  • use action listbox for rows
• Bottom bar layout
• Set up translations
• Same background color for window as for textview
• App icon Add app icon #3
• Appstream metadata
• Appstream screenshots
• Delete unused files from the repo
• When choosing "download" no voice is selected Download cancel - No voice selected. #4
• Rename "Darkman" to something less weird

From the Flathub review:

• Set up translations (including for desktop file and metainfo)
• Validate json manifest
• Why permission "--filesystem=xdg-run/tmp"? "multiarch"?
• C flags on espeak-ng?
• app/lib pythonpath
• Remove dummy.txt
• Remove dummy.wav
• Remove piper.so?
• Remove parolu.gresource in root folder?
• Remove piper git submodule?
• Remove bin folder?

What needs fixing longer term:

• Remove style class hack
• Inline spinner on the play button instead of "Synchronizing" dialog when you click play
• Port to UI XML
  • Port to Blueprint
• Drop loading dialog when playing audio
• Toast instead of error dialog when no voice is selected is super wide, awful copy, has OK button
• Add style.css
• Redesign Voice download/delete dialogs
  • combine them into single manage dialog
  • show download size on rows
  • icon for download button
  • in-row download progress
• Download/Delete Voice -> Voices