Via the Steam Store:
- Using Control + Alt in Quick Buy area now tells you how much gold you need for both the item and buyback
Dota 2 update for June 2, 2018
ClientVersion 2938
View all patches · Build 2827572 · Last edited August 11, 2018 – 09:06:01 UTC by 
Wendy
The following changelog has been automatically generated from GameTracking data.
General
- Updated localization files for English
English Localization
- DOTA_QuickBuyAlert_Buyback: %s1Need %s2 gold for <font color='%s3'>%s4</font>%s5 and <font color='#00FF00'>Buyback</font>
- DOTA_QuickBuyAlert_Enough_Buyback: %s1I have enough gold for <font color='%s2'>%s3</font>%s4 and <font color='#00FF00'>Buyback</font>