Fix grammar in some user facing request strings

These strings really hurt my eyes. po-file updates to follow.
update zypper-po.tar.bz2 and sle-zypper-po.tar.bz2
Merge pull request #36 from ddiss/ui_grammar

Ui grammar.
add --orphaned, --suggested, --recommended, --unneeded to 'zypper packages'
add new options for 'zypper packages'
improve package classification