Translating the sex menu is tough... It's all in JavaScript
The sex menu's actually pretty easy once you find out where all the pieces are. The Javascript parts of the menu only point to the text name somewhere else in the code. Like a script might read "\C[27]\V[41]" That script is pointing to lines in Common Event 24, titled "エロステータス文言挿入." The specific line for that one reads "セロでオナニー" on the menu which refers to how many times she's masturbated while thinking of the sick guy she's trying to save.
So, you could go to the common event and change this line "Control Variables : #0051 Tセロでオナニー = 'セロでオナニー'"
Change it to "Control Variables : #0051 Tセロでオナニー = 'Masturbated to Sero'" and then the text on her info page that originally read "セロでオナニー" has changed to "Masturbated to Sero."
You have now translated that one line of her Masturbation Info page.
Translating this isn't much different from any other game. He only split the pieces up among the Scripts, the Common Events, and other stuff. You just gotta figure out where it all is. I've found most of it, I'm just not where where her three "Thought" things at the bottom of each info page are. The titles for them like "Most Recent Sex Had" are inside the scripts, but the line below it that lists her actual most recent sex (I assume this changes each time she has sex due to the title), I haven't found yet.
Also, even if I find them all, I'm not 100% confident in my ability to translate it all correctly.