ICU validation (#3183)

## Description:

not sure if this should be approved or not?

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

resources/lang/ko.json

@@ -659,15 +659,15 @@
     "title_with_name": "{name}에게 병력 보내기",
     "available_tooltip": "현재 지원 가능한 병력",
     "min_keep": "최소 보유량",
-    "slider_tooltip": "{{percent}}% • {{amount}}",
+    "slider_tooltip": "{percent}% • {amount}",
     "aria_slider": "병력 슬라이더",
-    "capacity_note": "상대방은 지금 {{amount}}까지만 받을 수 있습니다."
+    "capacity_note": "상대방은 지금 {amount}까지만 받을 수 있습니다."
   },
   "send_gold_modal": {
     "title_with_name": "{name}에게 금 보내기",
     "available_tooltip": "현재 보유 중인 금",
     "aria_slider": "수량 슬라이더",
-    "slider_tooltip": "{{percent}}% • {{amount}}"
+    "slider_tooltip": "{percent}% • {amount}"
   },
   "replay_panel": {
     "replay_speed": "리플레이 속도",