Modding religion for noobs

[sbudy]

Hi, I'm trying to mod my custom faith into the vanilla faiths list via the instructions here:
https://ck3.paradoxwikis.com/Religions_modding
I have no problems with modding tenets and doctrines. They are quite straightforward. I'm having difficulties with the names. The wiki link claim that the adherents adjectives need to be specified as keys in localization, but does not specify where. The game does not recognize them when I try to specify them under localization = {...}.
Where should I specify them?
Are they in the same file (on folder \common\Crusader Kings III\game\common\religion\religions) or somewhere else?

[sbudy]

Nevermind, found it! It's in the localization folder
\localization\english\religion