Merge #557: Revert "qt: Do not use QObject::tr plural syntax for numbers with a unit symbol"

0c64401 Revert "qt: Do not use QObject::tr plural syntax for numbers with a unit symbol" (Luke Dashjr)

Pull request description:

  Apparently this got forgotten. Maybe too late for 23.x (it's a bugfix, but changes translation strings).

  This reverts commit 3adde72 (#296)

  per [GChuf](#296 (comment))

  >I can confirm for slovenian and other slavic languages that we do have 3 or 4 different ways of saying "%n GB needed%, depending on the actual number of gigabytes. Similar to english "is/are". There's no way to cover all cases ... this is exactly why transifex allows you to have more than 2 options.

ACKs for top commit:
  hebasto:
    ACK 0c64401, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: c01bae44a32b3ec324f2f9b8e4923bbb2e83bbd1460b745c5c911b98a9b2806fcbf815cfb19a1f1a7038c5c14312e102e7df8744c9002ef784b36d158e08eb14

Author: hebasto

src/qt/intro.cpp

@@ -298,12 +298,12 @@ void Intro::setStatus(int status, const QString &message, quint64 bytesAvailable
 
 void Intro::UpdateFreeSpaceLabel()
 {
-    QString freeString = tr("%1 GB of space available").arg(m_bytes_available / GB_BYTES);
+    QString freeString = tr("%n GB of space available", "", m_bytes_available / GB_BYTES);
     if (m_bytes_available < m_required_space_gb * GB_BYTES) {
-        freeString += " " + tr("(of %1 GB needed)").arg(m_required_space_gb);
+        freeString += " " + tr("(of %n GB needed)", "", m_required_space_gb);
         ui->freeSpace->setStyleSheet("QLabel { color: #800000 }");
     } else if (m_bytes_available / GB_BYTES - m_required_space_gb < 10) {
-        freeString += " " + tr("(%1 GB needed for full chain)").arg(m_required_space_gb);
+        freeString += " " + tr("(%n GB needed for full chain)", "", m_required_space_gb);
         ui->freeSpace->setStyleSheet("QLabel { color: #999900 }");
     } else {
         ui->freeSpace->setStyleSheet("");