Correcy Readme.md text
Complete fetching of translations for fields defaults (temporary solution)
Migrated context need the addition of tos field
In case of show_receivers==false, receivers should be all selected
Update appdata translations
Bump version number to 2.60.42.
Autodiscover globaleaks packages in setup.py.

Use setuptools' package discovery helper function instead of manually updating
the list on setup.py.
This fixes the missing globaleaks.models modules in "packages" on setup().