thunderbird upgrade problem

[gustavo halperin <ggh.develop@gmail.com>]

Today I made 'apt-get update' and 'apt-get dist-upgrade' after well.
The system ask for upgrade the next packages:
   libnspr4 libnss3 mozilla mozilla-browser mozilla-calendar 
mozilla-mailnews mozilla-psm thunderbird

I obviously accept and the I receive the next errors:
       Updating mozilla chrome registry...*** Registering -webcal handler.
       *** Registering text/calendar handler.
       *** Registering webcal protocol handler.
       done.
       Error: '/etc/mailcap' is not in required format -- not updated
              Restore from backup or delete and re-install mime-support 
packageError: '/etc/mailcap' is not in required format -- not updated
              Restore from backup or delete and re-install mime-support 
package
       Setting up mozilla-mailnews (1.7.8-1sarge7.1) ...
       Updating mozilla chrome registry...*** Registering -webcal handler.
       *** Registering text/calendar handler.
       *** Registering webcal protocol handler.
       done.
     
       Setting up libnss3 (1.7.8-1sarge7.1) ...
     
       Setting up mozilla-psm (1.7.8-1sarge7.1) ...
       Updating mozilla chrome registry...*** Registering -webcal handler.
       *** Registering text/calendar handler.
       *** Registering webcal protocol handler.
       done.
     
       Setting up mozilla (1.7.8-1sarge7.1) ...
       Setting up mozilla-calendar (1.7.8-1sarge7.1) ...
       Updating mozilla chrome registry...*** Registering -webcal handler.
       *** Registering text/calendar handler.
       *** Registering webcal protocol handler.
       done.

       Setting up thunderbird (1.5.1) ...
       Configuration de thunderbird

After these upgrades the thunderbird lose its configuration and also now 
is in French language. Whats happened here??

 Thank you,
       Gustavo