[Tracker] Removed/Changed some strings in tracker-search-tool

[Luca Ferretti <elle uca libero it>]

I've just committed the attached patch to remove some unused messages
and change other (maybe currently unused too) to current window title.

Now all strings marked for translation should appear in GUI.

Let me know if I forgot something.

Attachment: tracker-comment-unused-functions.diff
Description: Text Data