2.8.0

Slack is now fully available in French, Spanish, and German. Added support for external company collaboration and new name tagging capabilities. Changed "team" terminology to "workspace" when referring to the app itself. Added spellchecker language configuration in Preferences. Expanded notification delivery options (built-in, Action Center, Action Center Abbreviated) and positioning. Fixes include: rare crashes during calls/screen sharing, app hanging on certain timezone reports, "Something's Not Working" screen when waking from sleep, bright red Windows Action Center notifications, and duplicate notification sounds.