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)
In the chroot I only place files which content is "meaningful". For example, if the code checks for some executable being there (like in this case ```/usr/sbin/xkbctrl```) I don't want to place a fake ```xkbctr``` in the chroot.