Transfer: convert and display entered amount in fiat currency

LeftPanel.qml

@@ -238,7 +238,7 @@ Rectangle {
                     font.pixelSize: 16
                     text: {
                         if (persistentSettings.fiatPriceEnabled && persistentSettings.fiatPriceToggle) {
-                            return persistentSettings.fiatPriceCurrency == "xmrusd" ? "USD" : "EUR"
+                            return appWindow.fiatApiCurrencySymbol();
                         } else {
                             return "XMR"
                         }

components/LineEdit.qml

@@ -53,6 +53,8 @@ Item {
     property alias inlineButtonText: inlineButtonId.text
     property alias inlineIcon: inlineIcon.visible
     property bool copyButton: false
+    property alias copyButtonText: copyButtonId.text
+    property alias copyButtonEnabled: copyButtonId.enabled
 
     property bool borderDisabled: false
     property string borderColor: {

main.qml

@@ -1241,17 +1241,32 @@ ApplicationWindow {
         Prices.getJSON(url);
     }
 
-    function fiatApiUpdateBalance(balance){
-        // update balance card
+    function fiatApiCurrencySymbol() {
+        switch (persistentSettings.fiatPriceCurrency) {
+            case "xmrusd":
+                return "USD";
+            case "xmreur":
+                return "EUR";
+            default:
+                console.error("unsupported currency", persistentSettings.fiatPriceCurrency);
+                return "UNSUPPORTED";
+        }
+    }
+
+    function fiatApiConvertToFiat(amount) {
         var ticker = persistentSettings.fiatPriceCurrency === "xmrusd" ? appWindow.fiatPriceXMRUSD : appWindow.fiatPriceXMREUR;
         if(ticker <= 0){
-            console.log(fiatApiError("Could not update balance card; invalid ticker value"));
-            leftPanel.balanceFiatString = "?.??";
-            return;
+            console.log(fiatApiError("Invalid ticker value: " + ticker));
+            return "?.??";
         }
+        return (amount * ticker).toFixed(2);
+    }
+
+    function fiatApiUpdateBalance(balance){
+        // update balance card
         var bFiat = "?.??"
         if (!hideBalanceForced && !persistentSettings.hideBalance) {
-            bFiat = (balance * ticker).toFixed(2);
+            bFiat = fiatApiConvertToFiat(balance);
         }
         leftPanel.balanceFiatString = bFiat;
     }

pages/Transfer.qml

@@ -168,6 +168,10 @@ Rectangle {
                   labelText: qsTr("<style type='text/css'>a {text-decoration: none; color: #858585; font-size: 14px;}</style>\
                                    Amount <font size='2'>  ( </font> <a href='#'>Change account</a><font size='2'> )</font>")
                              + translationManager.emptyString
+                  copyButton: persistentSettings.fiatPriceEnabled
+                  copyButtonText: fiatApiCurrencySymbol() + " ~" + fiatApiConvertToFiat(amountLine.text)
+                  copyButtonEnabled: false
+
                   onLabelLinkActivated: {
                       middlePanel.accountView.selectAndSend = true;
                       appWindow.showPageRequest("Account")