||Checks if a string is included in another one (out of date)
||string1 ENTHÄLT string2
||string1, string2 : any strings
||true if string2 is included in string1
string2 has to be contained exactly, wild cards are not allowed.
'Paul' ENTHÄLT 'aul' -> true
'Paul' ENTHÄLT 'PAUL' -> false
ENTHÄLT is equal to HAT and HAS