selector for default language only

[ngrmm]

Is there a way to search in a multilingual-site only through default language values?
My selector for my other languages work like this:

$selectorEn = "seo_description.data1032~=$q, limit=50, template!='pw_child'";
$selectorFr = "seo_description.data1031~=$q, limit=50, template!='pw_child'";

1032 is english and 1031 ist french and my default language ID is 1021.
However this does not work

$selectorDe = "seo_description.data1021~=$q, limit=50, template!='pw_child'";

and this selector searches all languages

$selectorDe = "seo_description~=$q, limit=50, template!='pw_child'";

What i want is to search and get the results in different languages and show those results in the different languages.