Qt/Intro: Move sizeWarningLabel text into C++ code

src/qt/forms/intro.ui

@@ -55,9 +55,6 @@
    </item>
    <item>
     <widget class="QLabel" name="sizeWarningLabel">
-     <property name="text">
-      <string>%1 will download and store a copy of the Bitcoin block chain. At least %2GB of data will be stored in this directory, and it will grow over time. The wallet will also be stored in this directory.</string>
-     </property>
      <property name="wordWrap">
       <bool>true</bool>
      </property>

src/qt/intro.cpp

@@ -133,7 +133,11 @@ Intro::Intro(QWidget *parent) :
         }
     }
     requiredSpace += CHAIN_STATE_SIZE;
-    ui->sizeWarningLabel->setText(ui->sizeWarningLabel->text().arg(tr(PACKAGE_NAME)).arg(requiredSpace));
+    ui->sizeWarningLabel->setText(
+        tr("%1 will download and store a copy of the Bitcoin block chain.").arg(tr(PACKAGE_NAME)) + " " +
+        tr("At least %1 GB of data will be stored in this directory, and it will grow over time.").arg(requiredSpace) + " " +
+        tr("The wallet will also be stored in this directory.")
+    );
     startThread();
 }