[#1999] Added a link to expand/collapse all Deliverable rows to the sidebar

lang/en.yml

@@ -44,3 +44,4 @@ label_labor: "Labor: "
 label_fixed_amount: "Fixed Amount: "
 label_hours_estimated: "Hours Estimated: "
 label_hours_used: "Hours Used: "
+label_toggle_all: "Expand all deliverable rows"