Regenerate initrd after configuring keyboard (bnc#888804)

* Some autotranslated code polishing (in a different commit for easier review)
* Update dependency on yast2 >= 3.1.94 (new messages)
please check both return values if it suceed, otherwise we will have very hard time to debug testsuite failure in e.g. OBS. In perfect case just raise exception that it failed.