Simply add this lang key to add support for mods like Just Enough Effect Descriptions.

Effect descriptions already exist, as seen in the lang file: https://github.com/Sweenus/SimplySkills/blob/1.20.1/src/main/resources/assets/simplyskills/lang/en_us.json

If you're playing on the 1.19.2 version, this is very outdated and might be missing these.

I'm playing on 1.20.1. It seems EMIffect ignores the ".desc" lang keys. I will create a bug report there. My apologies.