You can set the language to be used for EQL parsing error messages.
If a language code is not specified, then en (English) is used as the default.
Note that this Language element serves a different purpose from the Language attribute in the TextSearchFilter type (for record search) and the ValueSearchConfig type (for value search).
<Request xmlns="http://www.endeca.com/MDEX/conversation/3/0">
<Language>fr</Language>
<State>
<SelectionFilter Id="AmtFilter">
<filterString>AMOUNT_SOLD > 1000</filterString>
</SelectionFilte>
</State>
...
</Request>
In this example, fr (French) is set as the language in which all EQL parsing error messages are returned.