Add filter to allow re-calculate shipping quotes message to change
Useful for themes that do not include the shipping calculator in their themes

*Also...*
added missing ',' to array declaration that is called for by coding standards
Removed filter targeted at replacing re-calculate message
Changed _wpsc_javascript_localizations to wpsc_javascript_localizations making it a generally available filter
Merge pull request #1152 from JeffPyeBrook/pr-issue-1151-calculate-message-filter

Add filter to allow re-calculate shipping quotes message to change