[#6574] Add a Labor Budget JS template for adding more budget items

The JS template is generated by Rails for adding a new record
and gets appended to the finance section using
addNewDeliverableFinance() (JS).

lib/redmine_contracts/hooks/view_layouts_base_html_head_hook.rb

@@ -9,6 +9,7 @@ module RedmineContracts
           return stylesheet_link_tag("redmine_contracts", :plugin => "redmine_contracts", :media => "screen") +
 
             javascript_include_tag('jquery-1.4.2.min.js', :plugin => 'redmine_contracts') +
+            javascript_include_tag('jquery.tmpl.min.js', :plugin => 'redmine_contracts') +
             javascript_tag('jQuery.noConflict();') +
             javascript_include_tag('contracts.js', :plugin => 'redmine_contracts')