gconf-editor 2.13.90 strings and UI changes

[Fernando Herrera <fherrera gmail com>]

Hi all,

gconf-editor 2.13.90 contains some minor strings and ui changes:

* "translator-credits" instead of "translator_credits"
* Translate "<no value>" string
* Removal of:
   _("Configuration Editor (Default Settings)")
  _("Configuration Editor (Mandatory settings)")

* For HIGfy the invalid argument (to command line) error dialog the
GTK_BUTTONS_CLOSE stock button changed to a OK one.

Sorry for the last minute changes (Anyway I'm planning to ask the
release team about a _big_ bug-buddy UI change after the XML-RPC)

Salu2