This modification will add the horn (klaxon) and a message in chat for World of tanks 0.9.16 after pressing the button G. the text of the message you can set in the configuration file mod.
WOT\res_mods\0.9.x\scripts\client\mods\Horns.xml

Mod is able to display a message for three types of objects: allies, enemies, and objects in the environment (earth, sky, destroyed equipment, buildings, etc.). For each object, you can configure your text message. In addition, you can change the activation button mod to any other. Note that the variable %(name)s displays the target name, only if it is available. Otherwise, you will use your player name.