stats: Add clear 'needs review' column to tables

On our translation stats: https://tpo.pages.torproject.net/community/l10n/stats.html or for each language: https://tpo.pages.torproject.net/community/l10n/ar.html we have several actionable links to go to weblate queries: strings failing checks, suggestions, needs edit. But we don´t have a clear 'needs review' list for reviewers to go straight there.

Hopefully adding that column will help increase the number of reviews