gh-pages build: i18n: update coverage to auto-detect browser languages (OverlayPlugin#946)

f285d76: `coverage.ts` detects language
from the web browser.
c0cf1de: fix Korean translation
8cbefb1: remove `languagesArr`
parameter from `browserLanguagesToLang` function.

## Removing `languagesArr` parameter

### Current Situation
The `browserLanguagesToLang` function has a comment saying it only takes
`navigator.languages` as input. But it still receives this value as a
parameter, which is unnecessary.

### Option 1: Remove the parameter
If the function only handles `navigator.languages`, we can remove the
parameter and use `navigator.languages` directly inside the function.

### Option 2: Generalize the function
If we want to support other locale arrays beyond `navigator.languages`,
we could keep the parameter and rename the function to `localesToLang`.
This makes it clear that the function converts any locale array to a
cactbot language.

---

This PR implements Option 1. Let me know if Option 2 is preferred. e14eec1

Author: github-actions

resources/ffxiv/LICENSE.txt

@@ -0,0 +1,6 @@
+Files in this folder are art reused from Final Fantasy XIV.
+
+FINAL FANTASY is a registered trademark of Square Enix Holdings Co., Ltd.
+
+Final Fantasy art and icons reused non-commercially under the
+[FINAL FANTASY® XIV Materials Usage License](https://support.na.square-enix.com/rule.php?id=5382).