[#2271] Added the Billable time to the issue details page.

lib/overhead_issue_hook.rb

@@ -0,0 +1,16 @@
+class OverheadIssueHook < Redmine::Hook::ViewListener
+  def view_issues_show_details_bottom(context={})
+    if context[:project].module_enabled?('budget_module')
+      billable_label = content_tag(:td,
+                                   content_tag(:strong, l(:overhead_billable_time)+":"),
+                                   :class => 'billable-hours')
+      billable_spent = content_tag(:td, l_hours(context[:issue].billable_time_spent))      
+
+      return content_tag(:tr,
+                         billable_label + billable_spent,
+                         :class => 'overhead-plugin')
+    else
+      return ''
+    end
+  end
+end