add: Added user param to .bank balance command, but only Bot Owner can use it

src/NadekoBot/data/strings/commands/commands.en-US.yml

@@ -4265,8 +4265,10 @@ bankbalance:
     Shows how much currency is in your bank account.
     This differs from your cash amount, as the cash amount is publicly available, but only you have access to your bank balance.
     However, you have to withdraw it first in order to use it.
+    Bot Owner can also check another user's bank balance.
   ex:
     - ''
+    - '@User'
   params:
     - {}
 banktake:

src/NadekoBot/data/strings/responses/responses.en-US.json

@@ -1040,6 +1040,7 @@
   "medusa_already_loaded": "Medusa {0} is already loaded",
   "medusa_invalid_not_found": "Medusa with that name wasn't found or the file was invalid",
   "bank_balance": "You have {0} in your bank account.",
+  "bank_balance_other": "User {0} has {1} in the bank.",
   "bank_deposited": "You deposited {0} to your bank account.",
   "bank_withdrew": "You withdrew {0} from your bank account.",
   "bank_withdraw_insuff": "You don't have sufficient {0} in your bank account.",