Since my issue with one thing got too large I decided to make it into other message, at first it was concerning calling Slavnikids "z Prczic" according to their seat of power while still calling Premyslid premyslid (if you are going to use one terminology like I noticed you do with other dynasties, then Premyslids can be called "z Czech" or "Czesky" since that was how they were called at the time.
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Now my second issue is with localization overall, czech as other languages evolved its writing overall, but using the word overall again, it was huge nonuniform mess, that only got some form of rules later (14-15th century once people actually started writing) so I would use the more uniform later forms for letters like č ř š and not mix all the forms (especially the earlier ones where normal "c" could be "cz" so you had no idea if it was read as czech "c" or "č", and the same went with "normal" "s")
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If you are going to include "č" as "cz", the also include "ř" as rz, if you are going to use "W" instead of "V", do it everywhere, "š" is difficult since it was written in many different ways at the time, (ff, ss, zz, sz) and following the trend I think settling on "sz" would be the best
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"ž" "ď " "ť " "ň" unfortunately do not have such counterparts and were sometimes used with the letter "i" or for example todays serbo-croatian uses "dj" etc but using the letter "j" in old czech is problematic because it was written as "g" back then (Jihlava was Gihlawa)
if "ž" happened to be before "e" then "Zie" was used (Example "ze Zierotina
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á é í ý ó ú were sometimes written as two normal letters next to each other, but it wasnt used that much and honestly it would look weird with some of them (especially yy) but other czech letter "ů" has different origin, it has that ° above it because it used to be "uo" which makes it usable
EDIT: I didnt notice that you can use áéíóú just fine so that one goes out the window, the one for ů still stands though
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after hours of work researching I gave up seriously though, almost half of all the dynasties, even if they are used for generic generation of nobles, are branches of much older dynasties, like the branches of the Markvartic family, out of 72 dynasties in 00_dynasties.txt marked as Bohemian, 8 of them are Markvartic, 9 are Vitkovic, 7 are benesovic, I also looked at the slovieni houses and got nicely confused, because Slavomirid was listed as bohemian dynasty, and then it was in the list again, but this time listed ad slovien dynasty, ie it was there 2 times (aside from Slavomir in great moravia which could be namewith that dynasty, Bohemia never had such a house in its history) then I also noticed that slovien has two dynasties that goe "Velehradsky" and "Veligradsky" which mean exactly the same thing just differently written. I will work on it later on and maybe I will submit something
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Either way, since I saw an issue with Slavnikids being refered to as "z Libicz" and Premyslids still being called Premyslids, even though in the files it was noted that it will be changed
I propose this, Premyslids represented the czechs, firstly as a tribe and then as a nation, while the subservient Slavnikids represented the Zličané tribe, so I would call Premyslids as "Czesky" and Slavnikids as "Zliczansky"