When reading Freud in the Standard Edition (SE) or original Gesammelte Werke (GW) on PEP-Web, the English and German texts are mapped to each other, paragraph by paragraph. By hovering over the translate icon in both versions, users are directly provided with the translation in the alternate language wherever there is a correspondence.
You can turn this feature on/off by clicking on the Help Menu icon 
on the main top toolbar and then selecting ‘Help Preferences’ from the dropdown menu. In the selection box that appears, click the button next to ‘Translation Concordance’ and then click ‘Done’.
