Ok, the issue was very funny. Solved it now for Cubase and Steinberg Hub.
You could call this as “user error”, but not exactly, because as the below.
Long long time ago I have removed “Segoe UI” font from my Win7 and set up all needed substitution registries.
It seems that Cubase having problems with font substitutions was simply loosing all the texts.
It looks like Cubase tries to read Segoe UI directly from file, but if no file, no texts.
All in all, fortunately (!!!), it was enough to put “Segoe UI” font only into the “Fonts” folder in the Cubase installation folder
(so that I still don’t need to see this font in my Win7). Hello Cubase, there is “font substitutions” feature in Windows.