Comment # 6 on bug 954505 from Ancor Gonzalez Sosa

(In reply to Luciano Santos from comment #4)
> A user have reported that when trying to install TW 20180222 with German
> locale (de_DE.UTF-8) he got this same error in Keyboard Settings (required
> for vconsole):  
> malformed format string - % ...  
> /usr/lib64/ruby/gems/2.5.0/gems/fast_gettext-1.6.0/lib/fast_gettext/vendor/
> string.rb:70:in `%'

Which typically means an error in the translated string (German in this case).
The translator didn't respect the number and shape of all the placeholders.