added italian translation and updated all translations

improved english translation

updated defibrillator with fixes: fixed typos, added code to cancel revival if the medic dies while he is reviving someone, added new convar which is set to 1 on default to prevent blinking of confirmed roles on round start (look convars description below), changed default value of revival success to 80 instead of 75 | added new comments to code

removed unnecessary code, added two missing convars, fixed a bug with the medigun, fixed some typos and updated workshop description

simplified entitiy validity and player checks, spec dm fix and arrival popup improvement - thanks ZacharyHinds

fixed specdm incompatibility and added some new comments to the code

fixed arrival popup that comes if a player is forced to the medic role mid round

fixed betrayel popup

added russian translation

minor improvements and improved arrival popup