I could not do the video, but I have a better explanation. Yast2 installer has Asturian language support but its keyboard layout is not correct, I mean, I cannot write the special Asturian characters ������ and ������ (instead I get ���� and ����), but with ���������������������������� I have no problem. Back to a fresh installed system ����, ���� and ���� can be typed but not ������������������������ which is strange. Going to Input Devices > Keyboard > Layouts there is no keyboard layout set (maybe KDE bug), instead I have to do it by hand checking "Configure layouts" and then press Add button. The "Limit selection by language" list forgets Asturian so i have to go through "Layout" list, select Spanish and then in "Variant" list, select "Asturian (Spanish, with bottom-dot H and bottom-dot L)" and apply changes. Now I can type ������ and ������ but ������������������������ not. On the other hand, I also set "Espa��a - asturianu (ast_ES)" as a system region but same result. Yast2 keyboard layout settings seem to be overriden at installation stage. I also reported this bug to KDE some months ago but no reply yet: https://bugs.kde.org/show_bug.cgi?id=356214