Fixes missing panel translations

Resolves brave/brave-browser#3426

Author: NejcZdovc

components/brave_rewards/resources/extension/brave_rewards/_locales/en_US/messages.json

@@ -332,5 +332,13 @@
   "walletFailedButton": {
     "message": "Try again",
     "description": "Button for re-try after wallet creation failed"
+  },
+  "addFunds": {
+    "message": "Add funds",
+    "description": "Button for adding funds"
+  },
+  "rewardsSettings": {
+    "message": "Rewards Settings",
+    "description": "Button for opening settings page"
   }
 }

components/brave_rewards/resources/extension/brave_rewards/components/panel.tsx

@@ -356,12 +356,12 @@ export class Panel extends React.Component<Props, State> {
         converted={utils.formatConverted(converted)}
         actions={[
           {
-            name: 'Add funds',
+            name: getMessage('addFunds'),
             action: this.openRewardsAddFundsPage,
             icon: <WalletAddIcon />
           },
           {
-            name: 'Rewards Settings',
+            name:  getMessage('rewardsSettings'),
             action: this.openRewardsPage,
             icon: <BatColorIcon />
           }