Minh Nguyen, 10/02/2015 12:27:
The portals are also kept as language-agnostic as possible, presenting a special challenge whenever any new functionality is introduced.
Indeed. Multilingual search should not be implemented in the portals as such, but rather in Special:Search on any project. We already got the interwiki search back, it's not impossible. https://phabricator.wikimedia.org/T26767#283887
Nemo