I don't remember precisely, but I think there's more to mod than the mere descr_strat file if you want to unite Roman factions.

There are plenty of thread dealing with this subject, like this one:
https://forums.totalwar.org/vb/showthread.php?t=70329

For CTD issues, you should first check in here
https://forums.totalwar.org/vb/showthread.php?t=58801
Did you kept a note of what you changed ?

Then, have a look in the Scriptorium, and in modding answers

More importantly
Do you have a back up ?

If you manage to go back to the original version, I think there's a united rome patch somewhere. It should definitely come in handy.