merge with debian-sid

merge with debian-sid

[ Christian Perrier ]
* Fix encoding for Slovenian translation. PO file switched
  to UTF-8. Closes: #609957

[ David Kalnischkies ]
* ftparchive/apt-ftparchive.cc:
  - fix endless loop for multiple TranslationsWriters

[ Julian Andres Klode ]
* cmdline/apt-cache.cc: Create an error for apt-cache depends
  if packages could not found (LP: #647045)

[ Manpages translations ]
* Correct a typo and an error in French manpages translation.
  Closes: # 607170
[ Programs translations ]
* po/es.po: Updated, plus fixes encoding issues and fixes two fuzzy
  strings, thanks to Javier Fernandez-Sanguino (closes: #610692)
* Spanish update by Javier Fernández-Sanguino Peña. Closes: #607145