fixed and tested https://github.com/globaleaks/GlobaLeaks/issues/600
implemented footer configuration https://github.com/globaleaks/GlobaLeaks/issues/576
updated Context format to supports better localized fields
updated handlers unitTest with new fields supports (need works on it)
refactored Fields logic with a dedicated utility class
Merge branch 'feature/footer_and_themes' into issues/648_multilang_fields
supported migration script for new fields format
implemented preview extraction in new Fields utility
fixed and aligned UT with new Fields design
Merge branch 'issues/600_checksum'

Conflicts:
	globaleaks/handlers/files.py
	globaleaks/jobs/delivery_sched.py

fixed test_submission.py (was missing transact_ro)
Merge branch 'issues/648_multilang_fields'

Conflicts:
	globaleaks/__init__.py
	globaleaks/handlers/node.py
	globaleaks/handlers/submission.py
	globaleaks/settings.py
	globaleaks/tests/helpers.py
	globaleaks/tests/test_jobs.py
implemented Rosetta, helps localization and multilanguage supports
Merge branch 'master' of github.com:globaleaks/GLBackend

Conflicts:
	globaleaks/__init__.py
minor cleaning in bruteforce sleep checks
splitted utils.py in structures, utility and mailutils
resolved two include bug after utils restyle
fix against issue https://github.com/globaleaks/GlobaLeaks/issues/690
update auth API https://github.com/globaleaks/GlobaLeaks/issues/603
Merge branch 'fix/issue/690' into premerge/devel
fixed two typos from https://github.com/globaleaks/GlobaLeaks/issues/690