Updates the Korean (koKR) locale for 8.4.9.

[labrie75]

What does this PR do?

Updates the Korean (koKR) locale for 8.4.9.

• Adds new catalog entries for strings that were still English on the koKR client.
• Korean terminology cross-checked against official Blizzard koKR data (GlobalStrings / spec, spell, and item names), so in-game terms match the official client localization.
• Locale data only -- no engine or module code is touched. Untranslated keys still fall back to English as before.

How was it tested?

Tested in game on live retail with the koKR client: options panel pages, module tooltips, confirmation popups verified visually. File parses clean (Lua syntax checked), UTF-8 without BOM preserved, and no load errors.

Screenshots

N/A -- text-only locale data (no layout/visual change).

Checklist

• New settings default OFF -- N/A (locale data only, no settings added)
• Zero cost while disabled -- N/A (no events, hooks, frames, or code; translation table only)
• Cheap while enabled -- N/A (same single catalog lookup path as every existing locale)
• No writes onto Blizzard-owned frames -- N/A (no frame code)
• Tested in-game, works on live retail; no load errors (data-only table, no API calls; not separately run on 12.1 PTR)