This card tracks a proposal that's currently part of the Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey

The Wishlist Survey voting phase lasts until Dec 14th. After the voting has concluded, the top proposals will form the backlog for the Community Tech team to investigate and address.

Proposal:

Allow users to search across all languages of a project, e.g. to optionally return results of a search on English Wikipedia across all the Wikipedias.

Fences and windows (talk) 12:37, 14 November 2015 (UTC)

https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey/Search#Multilingual_search