[LyX/master] Remove redundant code and clarify strings

[Pavel Sanda]

On Sat, Sep 02, 2023 at 01:12:13PM +0200, Juergen Spitzmueller wrote:
> commit aaae3ad5cc976cdf6082369757943304bad6c8db
> Author: Juergen Spitzmueller <spitz at lyx.org>
> Date:   Sat Sep 2 14:28:33 2023 +0200
> 

I know it was not officially declared, but I thought the idea was
that beta5 will have final set of strings...?
Pavel