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antp
The title attribute is there for the tooltip (even if alt has been wrongly used in the past)
Nowadays javascript is used for that, to have tooltips with a style coherent with the site design, and also coming faster: the default tooltip need the mouse to stay immobile over the object for more than a second.
To answer the original question: that info is not stored/kept.
For the next version, it could be retrieved from the log history of the contributions, maybe in a future version (yes, future compared to the one that's not yet there) such info could be added for admins.
Nowadays javascript is used for that, to have tooltips with a style coherent with the site design, and also coming faster: the default tooltip need the mouse to stay immobile over the object for more than a second.
To answer the original question: that info is not stored/kept.
For the next version, it could be retrieved from the log history of the contributions, maybe in a future version (yes, future compared to the one that's not yet there) such info could be added for admins.