Prices: add support for AUD

src/sendwidget.ui

@@ -136,6 +136,11 @@
            <string>RMB</string>
           </property>
          </item>
+         <item>
+          <property name="text">
+           <string>AUD</string>
+          </property>
+         </item>
         </widget>
        </item>
       </layout>

src/settings.ui

@@ -53,6 +53,11 @@
            <string>GBP</string>
           </property>
          </item>
+         <item>
+          <property name="text">
+           <string>AUD</string>
+          </property>
+         </item>
          <item>
           <property name="text">
            <string>CAD</string>

src/utils/prices.cpp

@@ -27,6 +27,7 @@ Prices::Prices(QObject *parent) : QObject(parent) {
     fiat["CHF"] = "Fr";
     fiat["CNY"] = "¥";
     fiat["CZK"] = "Kč";
+    fiat["AUD"] = "$";
 }
 
 void Prices::cryptoPricesReceived(const QJsonArray &data) {