Sic—generally inside square brackets, [sic], and occasionally parentheses, (sic)—when added just after a quote or reprinted text, indicates the passage appears exactly as in the original source. The usual purpose is to inform readers that any errors or apparent errors in the copied material are not from transcription—that they are reproduced exactly from the original writer or printer. A bracketed sic may also be used as a form of ridicule or as a humorous comment, typically by drawing attention to the original writer's mistakes.
Here, Sic will be used to refer to a section of text taken directly from the game that was incorrect, either with spelling, grammar, etc. The exceptions to this are with improper capitalization and period usage. A large number of capitalization errors occur in-game, such as refering to City/city, Farms/farms, etc. Because these are so prevailant, noting each would be obtrusive, but anywhere other than direct game quotes, all uses of these words when refering to a specific building will be capitalized. The other exception is period usage, where such a large number of in-game quotes fail to end in a period. Going the other way on this one, all of these have had a period simply added to the end, as being after the quote itself is not interfering with the quote, and thus not changing the quote.
For more information: Sic: Wikipedia