norsvenska 952d2cfa89 Adds station prefixes for Christmas (#76225) ...

## About The Pull Request

Adds 15 different station prefixes for Christmas, because there were
none previously (why?)

## Why It's Good For The Game


![image](https://github.com/tgstation/tgstation/assets/73006946/4fd9823b-8cd8-48af-a4ec-99e706136c4f)
that's right, why doesn't christmas have special prefixes?
well now it does

## Changelog

🆑
add: Christmas now has special station prefixes.
/🆑

2023-06-24 11:47:18 +02:00

..

foreign_calendar.dm

…

holidays.dm

…

nth_week.dm

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