I'm using ET with i18n on l10n_install profile
Right now admin can configure language filter and fallback in 2 different places:
Enable language fallback in
Select nodes by language in
These configurations do not correctly fallback. For example, if the language is selected as EN and a node is not in that language the fallback system will show nodes in all other languages, including UND. It should fallback only to UND (undefined language), or give option to fallback to any languages enalbed.
Also, filtering nodes for a specific language in
/admin/config/regional/entity_translation displays only nodes originally written in that languge. It does not display the translations done on ET. It has to be fixed to display that nodes translated using ET.