Spellchecking dictionaries in LyX 2.4 installer

[Yuriy Skalko]

> I think this is a reasaonable idea. What do we include by default now?
> 
> Riki

Here are default languages:

Deutsch (D)
English (GB)
English (US)
Espanol (ES)
Espanol (MX)
Francais

And these are always installed and cannot be unselected in installer. 
Maybe it will be better to select some languages by default, but give 
user option not to install unneeded languages?

Selecting all languages for spellchecking in the installer gives +230 
MB, so probably it is too much.

As I understand the most recent versions of dictionaries are here:
https://github.com/LibreOffice/dictionaries


Yuriy