I think he misunderstood the meaning of the sentence.
In his translation it would mean "Show only complete string", what is not the meaning of the option.
The real purpose of this option is to find a exact match, with all given letters. No more, no less.
In this case, the Translation is:
Ganze Zeichenfolge vergleichen.
or if you really want to say (what i mean is better) that you have to get a EXACT match:
Exakte Zeichenfolge vergleichen.
The Translation of "Find..." is right, but it should be written Uppercase:
Suchen...