1. Go to 'cstrike/addons/amxmodx/configs' and open the config file 'grenade_callouts.ini' on Notepad.
2. Copy the texts below and replace the FIRST 9 LINES in the config file with the copied texts. Save and exit.

Flashbang!
Deploying flashbang!
Throwing flashbang!
Granate!
Grenade out!
Throwing a grenade!
Smoke!
Throwing smoke.
Laying down smoke.