warty installer localization

[Matthias Klose]

Bug item #1232 contains some updates. Maybe something can still be
merged. A lot of translations are simply wrong (Saying installing,
instead of configuring, etc). Some new attachments:

- debian/po-updates: de, fr, ca, el updates sent by various people.

- po file updates: a merge of all non-fuzzy translations from the
  debian installer. I'd like to have some feedback, if these are
  correctly merged.

- work needing translations: a list with things, which still need
  to be done.


Matthias