You can find the mods themselves in numbered folders in the "Steam\SteamApps\workshop\content\1191840" folder. If you open the .gd in nearly any text editor it will show you everything. For creatures you want to translate the only non-English lines that aren't started with a #. Which should mostly just be the name and the addSkillTxt(" lines. If you decide to translate a mod watch out for copy pasting from google translate because if it has a status effect at the end of the line with [ ] around it then google likes to move the " around on you.

For example.
addSkillTxt("something in Chinese [Chinese for a status like poison]")
often comes out of google as
addSkillTxt ("Creature inflicts [Poison]" on attack)
You need to get rid of the space after the addSkillTxt and put the " back where it belongs.

It is up to you if it is less effort to translate each ability by itself and avoid having to do that, or let google translate the entire block of abilities and just clean it up yourself afterwards.

I would copy the mod folders somewhere else to translate just in case the mod maker updates the mod and it overwrites your local copy. You wouldn't want to lose all your work.