pakfire.cgi: Changes to install and remove confirmation pages

pakfire.cgi: Changes to install and remove confirmation pages

- On install confirmation page, add list of packages to install
   - if package is already installed, don't show it on the list

 - On install and remove confirmation pages, pad out translation
   of "Package:" to length of 10 so that the column spacing doesn't
   change for different languages.

 - Display dependencies for package(s) to remove in 'parent -> child'
   format.

 - Display packages in use in 'parent -> child' format.

 - Add translations for new text in all langs.

 - functional changes
   - When removing a package, remove it's dependencies.
   - Don't allow a package or dependency to be removed if other
     installed packages depend on it.

Signed-off-by: Stephen Cuka <stephen@firemypi.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>