Поправил отзывчивость кнопок валют на экране валюты, исправил отображение названий валюты на экранах проведения покупки (рубль, рубля, рублей) для русской локали

lib/screens/purchase_success.dart

@@ -1,26 +1,36 @@
-import 'package:flutter/material.dart';
-
+import 'package:checker/base/base_state.dart';
 import 'package:checker/common.dart';
 import 'package:checker/consts.dart';
+import 'package:checker/db.dart';
 import 'package:checker/strings.dart';
-import 'package:checker/base/base_state.dart';
+import 'package:flutter/material.dart';
 
 /// Экран проведения покупки.
 class PurchaseSuccessScreen extends StatefulWidget {
 
-  PurchaseSuccessScreen(this.val, this.name);
+  PurchaseSuccessScreen(this.val, this.name, this.helper, this.app);
+
   final String val;
   final String name;
+  final String app;
+  final SqliteHelper helper;
 
-  @override State createState() => new PurchaseSuccessScreenState(val, name);
+  @override State createState() =>
+      new PurchaseSuccessScreenState(val, name, helper, app);
 }
 
 class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
 
-  PurchaseSuccessScreenState(this.sum, this.username);
+  PurchaseSuccessScreenState(String sum, String username, SqliteHelper helper,
+      String app) {
+    this.sum = sum;
+    this.username = username;
+    this.helper = helper;
+    this.app = app;
+  }
 
-  String sum;
-  String username;
+  String sum, username;
+  int currency;
 
   @override String getTitle() {
     return StringsLocalization.carryingPurchase();
@@ -30,6 +40,17 @@ class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
     return null;
   }
 
+  @override Widget build(BuildContext context) {
+    if (currency == null) {
+      helper.getCurrency().then((currency) {
+        setState(() {
+          this.currency = currency;
+        });
+      });
+    }
+    return getMainWidget();
+  }
+
   @override Widget getScreenContent() {
     return new Column(children: <Widget>[
       getValueWithDescription(StringsLocalization.buyer(), username),
@@ -50,14 +71,22 @@ class PurchaseSuccessScreenState<T> extends BaseState<PurchaseSuccessScreen> {
   }
 
   getSuccessMessage() {
-  	return new Row(children: <Widget>[new Expanded(child: new Container(margin: new EdgeInsets.only(top: 20.0), height: 64.0,
-      decoration: new BoxDecoration(color: greenBackground),
-      child: new Center(child: new Text(getMessageTitle(), textAlign: TextAlign.center,
-        style: new TextStyle(fontWeight: FontWeight.bold, color: tokenActiveTextColor)))))]);
+    return new Row(children: <Widget>[new Expanded(child: new Container(
+        margin: new EdgeInsets.only(top: 20.0), height: 64.0,
+        decoration: new BoxDecoration(color: greenBackground),
+        child: new Center(
+            child: new Text(getMessageTitle(), textAlign: TextAlign.center,
+                style: new TextStyle(fontWeight: FontWeight.bold,
+                    color: tokenActiveTextColor)))))
+    ]);
   }
 
   getMessageTitle() {
-    return StringsLocalization.purchaseCompleted(sum);
+    if (currency != null) {
+      return StringsLocalization.purchaseCompleted(sum, currency);
+    } else {
+      return '';
+    }
   }
 
 }