Revert "Add ES 5 syntax check (#4291)"
Revert "Add ES 5 syntax check (#4291)"

This is only needed in '5.3', thus it is being reverted for 5.4+.

This reverts commit 2d35dbce84fbe97e8dc80629d889b51953e1641e.

WoltLab/WCF,Cyperghost/WCF,SoftCreatR/WCF,WoltLab/WCF,Cyperghost/WCF,SoftCreatR/WCF,SoftCreatR/WCF,SoftCreatR/WCF,Cyperghost/WCF,Cyperghost/WCF,WoltLab/WCF,WoltLab/WCF,Cyperghost/WCF