Description:
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In the german translation for mysql_real_escape_string the second (optional) parameter for the function is stated as "resource Ergebnis-Kennung" which is the translation for "resource result". 
This is obviously wrong, as the function doesn't use a result resource, but rather a link_identifier resource, as stated in the english version. In line with the translation for mysql_query, the translation for "resource link_identifier" should be "resource Verbindungs-Kennung".

The error occurs two times in the description of the function: First in the notation of the function itself and second where the parameters are listed. The description of the parameter itself is correct, it is just the translation of the parameter name, which is wrong. 

Correctly the function notation should be like this:
"string mysql_real_escape_string ( string unescaped_string [, resource Verbindungs-Kennung] )"
And in the Parameter list the parameter should be listed as:
"Verbindungs-Kennung"