Hello Lumpy Burgertushie,
I don't belive it needs those files. the board is expecting to already have english installed. usually those
I have the very same problem with my Spanish language pack:
Language pack details
English name: Spanish (Casual Honorifics)
Local name: Español (Tú)
ISO code: es-x-tu
Language pack author: phpBB España
The following language files are missing from the “Español (Tú)” language folder
Missing language files
Here, two files are missing (not three).
The only language pack that doesn't produce this error message is the French Language pack (the local version downloaded from phpBB-fr).
I may be overtly perfectionist, but I don't think it is normal to get error messages when one downloads official language packs from phpBB.com.
I just want to solve this irritating problem!