Fixed several exceptions in fragment views.
Fixed incorrect invoice datetime for cached invoices.

Datetime of each invoice is now saved together with the invoice filename
in the local storage. To prevent saving a lot of invoices per profile
whenever invoice for a profile is updated all invoices for the given
profile are cleared first.
Added invoice BG translations.
Fixes in invoice layout: column text wrapping.
Updated THANKS TO list
Workaround for View is <null> problem.
Updated HISTORY