It is currently not possible to search all languages
unless you search through an external search engine, but I
don't think most people realise how this works, and the
convenient links to other search engines won't be
available once we get the new database servers.
I show below an unsigned comment that came from
[[Meta:Wikimedia site feedback]]:
Today I was looking for "Kalignost" which happens to be a
german brandname for tetraphenylborate. The english
language search didn't come up with anything, not even
links to "other languages" ... with reference to the
previous point, I would think this could be helpful ...
**Workaround**: **Install [[https://en.wikipedia.org/wiki/MediaWiki_talk:Wdsearch.js|wdsearch]] on your wiki to help progress**.
This card tracks a proposal from the 2015 Community Wishlist Survey: https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey
This proposal received 8 support votes, and was ranked #73 out of 107 proposals. https://meta.wikimedia.org/wiki/2015_Community_Wishlist_Survey/Search#Multilingual_search