Goals: Add goals tab in TP overview

Fixes bug 3073
Goals: Cache goal stats for TPs

Fixes bug 3113
Goals: Enable translate links in goals tab

Fixes bug 3098
Goals: Provide drill down on goals tab

Fixes bug 3107
Goals: Provide a form for editing the goal on each drill down view

Fixes bug 3094
Goals: Show most important incomplete goal on summary

Fixes bug 3117