The Decalogue Society of Lawyers’ annual installation dinner didn’t start with a lengthy welcome address or an overview of the night’s events — it started with its incoming president singing two nations’ songs of hope and unity.Many who attended the Wednesday night event at the Union League Club sang along with Mitchell B. Goldberg as he led the group through both the “Star- Spangled Banner” and “Hatikvah” — which translates to “The Hope” — a …