Actually, there is a better way to edit the compliments instead of changing in the config.js
Go to this path and type the command -
cd /MagicMirror/modules/default/compliments
sudo nano compliments.js
Edit the 4 different session of the day and customize different greeting as much as you like.
In addition, you can change the compliments refresh rate at the
updateInterval: 30000, //change the value from 30000 to 10000 to see the different
Enjoy!