I created a cck field for images and labled it "Bilder" which is german for images. Now I export the feature and the content.inc contains:
// Translatables array( t('Bilder'), );
t() shouldn't get strings in other language than english or it will mess up the translation table.
features_translatables_export() should check what language is the current global language.
If its other than "english" it should not add the found strings to t().