Merge branch 'hotfix/authenticate-and-expire-download-zips'
Latest translations from Transifex.
Merge branch 'hotfix/0.6.8-last-translations'
Rails security update.
Security update for newrelic
Merge branch 'hotfix/0.6.8.3' into release/0.6.9

Conflicts:
    Gemfile.lock
    locale/ar/app.po
    locale/cs/app.po
    locale/cy/app.po
    locale/en_IE/app.po
    locale/es/app.po
    locale/pt_BR/app.po