The one in data/text uses the squiggly brackets you just follow what is above
i.e.
{Cyrenaica} Cyrenaica
{Cyrene} Cyrene
{Region_name} tab tab tab In game region name
{City_name} tab tab tab In game city name

Bit in brackets must tie up with spelling etc in descr_regions.txt, text outside bracket can be whatever you want to appear in game

descr_regions_and_settlement_name_lookup.txt
just uses:
Cyrenaica
Cyrene
Region_name
City_name

again that is names as used in descr_regions.txt
NB: You need a different name for the region than that used for the city.

If that is all OK - silly thought - I wonder if it minds having number in region name, maybe try Test_A instead.