2/21/2010
👨💻 Svn 0.2.5.
On February 21, 2010, Satoshi updates the Bitcoin user interface. The release is numbered 0.2.5.
Sources:
https://archive.bitcoin-calendar.org/archive/1749191175.044008/index.html
https://bitcointalk.org/index.php?topic=60.msg426#msg426