fix(i18n): correct ICU placeholders in en send resource messages (#3171)

## Description:

fix en.json 


## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [ ] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [ ] I have added relevant tests to the test directory
- [ ] 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:

DISCORD_USERNAME

Co-authored-by: Ryan <7389646+ryanbarlow97@users.noreply.github.com>

resources/lang/en.json

@@ -799,15 +799,15 @@
   "send_troops_modal": {
     "title_with_name": "Send Troops to {name}",
     "available_tooltip": "Your current available troops",
-    "slider_tooltip": "{{percent}}% • {{amount}}",
+    "slider_tooltip": "{percent}% • {amount}",
     "aria_slider": "Troops slider",
-    "capacity_note": "Receiver can accept only {{amount}} right now."
+    "capacity_note": "Receiver can accept only {amount} right now."
   },
   "send_gold_modal": {
     "title_with_name": "Send Gold to {name}",
     "available_tooltip": "Your current available gold",
     "aria_slider": "Amount slider",
-    "slider_tooltip": "{{percent}}% • {{amount}}"
+    "slider_tooltip": "{percent}% • {amount}"
   },
   "replay_panel": {
     "replay_speed": "Replay speed",