Change text to past tense

[hopetez]

zcatch/src/game/server/player.cpp

Line 720 in a1115e2

 str_format(aBuf, sizeof(aBuf), "You were released, because '%s' is leaving the game.", Server()->ClientName(m_CaughtBy)); 

would make more sense if the text would be in past tense

change the last part to "has left the game."