Localized more Danish strings
Merge pull request #367 from Joergen/uge44_da

Localized more Danish strings
Integrated lib/crypto from zamboni. (bug 1070189)
Sign addon files during review process (bug 1070189)
Management command to sign addons (bug 1070191)
Needs some more love
Renamed most of "app" terms to "addon" (bug 1070189)

Plus, many tests and travis fixes
Fixes related to magopian's review
Signing all addons script (bug 1070227)