Navigation: Display Starred dashboards in the Navbar (#51038)

* remove feature toggle, add empty state and fix bug with initial starring

* Extract empty message into lingui

* remove full stop

* add empty message in the backend

* remove unused import

* translate starred + empty starred states

* betterer changes

pkg/api/dtos/index.go

@@ -74,6 +74,7 @@ type NavLink struct {
 	Children         []*NavLink `json:"children,omitempty"`
 	HighlightText    string     `json:"highlightText,omitempty"`
 	HighlightID      string     `json:"highlightId,omitempty"`
+	EmptyMessageId   string     `json:"emptyMessageId,omitempty"`
 }
 
 // NavIDCfg is the id for org configuration navigation node