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.
Fire in the hole!
Grenade out.
Throwing a grenade!
Smoke!
Throwing smoke.
Laying down smoke.