Translate menu item made by view
After defining your menu item via views, you have to go back to the views list (/admin/structure/views). There is a "Translate" option under "Edit".



There, you can "Add" a translation, then choose your page display options and translate the menu item (applies for Drupal 8 only).



If the menu item is not showing up, clear the caches (e.g. cache rebuild using drush cr).