[dev] Empty mailbox message

[Federico Giannici]

According to me, in the IMP Mailbox view, the message "There are no
messages in this mailbox." should be changed into "There are no messages
in this folder."

Moreover, the message would be more readable and evident if it have an
empty line before and after it.


Bye,
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   |-                      giannici@neomedia.it
   |ederico Giannici      http://www.neomedia.it
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