yi: Yiddish
Verify this language code:
✔ yi is a well-formed language code. 
✔ This seems to be a code for an actual language.
✔ This language code is enabled on Translatewiki.
MediaWiki core messages: 65.08 %: 2555 / 3926 messages
Most important messages: 100.0 %: 145 / 145 messages
Collection extension: 4.7 %: 7 / 149 messages
ProofreadPage extension: 24.86 %: 46 / 185 messages
Android Wikipedia app: 12.8 %: 280 / 2187 messages
iOS Wikipedia app: 7.82 %: 141 / 1804 messages
Main extensions used by Wikimedia: 27.69 %: 1964 / 7092 messages
Most important messages: 100.0 %: 145 / 145 messages
Collection extension: 4.7 %: 7 / 149 messages
ProofreadPage extension: 24.86 %: 46 / 185 messages
Android Wikipedia app: 12.8 %: 280 / 2187 messages
iOS Wikipedia app: 7.82 %: 141 / 1804 messages
Main extensions used by Wikimedia: 27.69 %: 1964 / 7092 messages
✔ This language code is available for general use in MediaWiki.
✔ This language is available for general use on Wikidata.