Merge branch 'issue/365'

* issue/365:
  Only display language selector if more than 1 language is available
  Fix styling bugs introduced in previous commits
  fixed PGP receiver preferences view
  english sentence corrected
  removed multipart encoding from form configuration
  fixed a bug related to checkbox in receiver preferences
  Fix bug in language selection switching
  .travis.yml aligned to GlobaLeaks repository
  fixed tor2web security settings configuration
  fixed regexp_receipt (missing escape for backslash)
  enhanced admin view for https://github.com/globaleaks/GlobaLeaks/issues/187
  completed Admin UI for https://github.com/globaleaks/GlobaLeaks/issues/416
  modify starting page with https://github.com/globaleaks/GlobaLeaks/issues/416
  customization message https://github.com/globaleaks/GlobaLeaks/issues/418
  added the default value for receipt_regexp=[A-Z]{4}\+[0-9]{5}
  restored GPG in GLClient: https://github.com/globaleaks/GlobaLeaks/issues/187
Make the submission steps translatable

This fixes: https://github.com/globaleaks/GlobaLeaks/issues/404
Merge pull request #75 from globaleaks/issues/404

Issues/404