Ah, since you're here, I might as well mention that I also spotted some missing text in-game while trying a SP game. Nothing big, but the upgrade unit button doesn't say anything except "UPGRADE UNIT" when you mouse-hover, though the button still works. The text for "You do not have enough money to upgrade" is fine, though. Forgot to check the one for "cannot upgrade unit is outside borders".
Also missing is:
When you capture a barbarian settler or worker, the dialog that pops up only says "Do you wish to return this unit?" without mentioning former owner or any other details.
The mouse-hover dialog for the button on the right side for "Your spy has killed a spy from Player X" is missing, but if you click the button it still takes you to the Player X diplomacy screen. Other spy buttons (Player X has stolen Astronomy! An unknown player has stolen Refrigeration! Player Y has attempted a coup but failed!) behave as normal, but I never encountered certain buttons, since I never had to spy on anyone for tech or to discover their secret plans. Also, I never saw a single "Your influence has mysteriously dropped due to enemy spies" button, which is very weird, because I usually get a ton of those. Also, no one ever warned me about anyone's secret plans to attack me, but I could have just been too powerful

.
All in all, it was a surprisingly smooth ride, though.