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)
you are right, it really returns only nil, which is quite stupid from my pov as handle can be invalid - https://github.com/yast/yast-core/blob/master/wfm/src/WFM.cc#L60