I reverted your changes to the overviews. Instead of changing titles/overviews, the episode numbers should be changed. This helps preserve data across translations; every translation should hold the data for the same episode. Please provide a source that those two episodes should have their episode numbers swapped.

Just to chime in, Wikipedia has an explanation on why there is confusion here. The US and the UK aired them in different orders.

"Sky One aired "Serpent's Song" on January 6, 1999, and "Holiday" one week later on January 13, 1999. Showtime, however, aired "Holiday" on February 5, 1999, and "Serpent's Song" one week later on February 12, 1999. The British order is also the episode order on the DVDs."

@NavySealsGuy said:

Just to chime in, Wikipedia has an explanation on why there is confusion here. The US and the UK aired them in different orders.

"Sky One aired "Serpent's Song" on January 6, 1999, and "Holiday" one week later on January 13, 1999. Showtime, however, aired "Holiday" on February 5, 1999, and "Serpent's Song" one week later on February 12, 1999. The British order is also the episode order on the DVDs."

Thank you for the explanation. Since Showtime is the original network, the main list uses that order and air dates, not the British one. There is an episode group for the DVD order.