diff --git a/src/lib/downloads/downloaditem.cpp b/src/lib/downloads/downloaditem.cpp
index 33014d0a4..126740fab 100644
--- a/src/lib/downloads/downloaditem.cpp
+++ b/src/lib/downloads/downloaditem.cpp
@@ -28,6 +28,7 @@
 
 #include <QMenu>
 #include <QClipboard>
+#include <QLocale>
 #include <QListWidgetItem>
 #include <QMouseEvent>
 #include <QTimer>
@@ -216,18 +217,19 @@ QString DownloadItem::currentSpeedToString(double speed)
         return tr("Unknown speed");
     }
 
+    QLocale locale;
     speed /= 1024; // kB
     if (speed < 1000) {
-        return QString::number(speed, 'f', 0) + QLatin1String(" ") + tr("kB/s");
+        return tr("%1 kB/s").arg(locale.toString(speed, 'f', 0));
     }
 
     speed /= 1024; //MB
     if (speed < 1000) {
-        return QString::number(speed, 'f', 2) + QLatin1String(" ") + tr("MB/s");
+        return tr("%1 MB/s").arg(locale.toString(speed, 'f', 2));
     }
 
     speed /= 1024; //GB
-    return QString::number(speed, 'f', 2) + QLatin1String(" ") + tr("GB/s");
+    return tr("%1 GB/s").arg(locale.toString(speed, 'f', 2));
 }
 
 void DownloadItem::updateDownloadInfo(double currSpeed, qint64 received, qint64 total)
diff --git a/src/lib/tools/qztools.cpp b/src/lib/tools/qztools.cpp
index e7dda719d..6d85dd49c 100644
--- a/src/lib/tools/qztools.cpp
+++ b/src/lib/tools/qztools.cpp
@@ -32,6 +32,7 @@
 #include <QWidget>
 #include <QApplication>
 #include <QSslCertificate>
+#include <QLocale>
 #include <QScreen>
 #include <QUrl>
 #include <QIcon>
@@ -378,18 +379,20 @@ QString QzTools::fileSizeToString(qint64 size)
         return QObject::tr("Unknown size");
     }
 
+    QLocale locale;
+
     double _size = size / 1024.0; // KB
     if (_size < 1000) {
-        return QString::number(_size > 1 ? _size : 1, 'f', 0) + QLatin1Char(' ') + QObject::tr("KB");
+        return QObject::tr("%1 kB").arg(locale.toString(_size > 1 ? _size : 1, 'f', 0));
     }
 
     _size /= 1024; // MB
     if (_size < 1000) {
-        return QString::number(_size, 'f', 1) + QLatin1Char(' ') + QObject::tr("MB");
+        return QObject::tr("%1 MB").arg(locale.toString(_size, 'f', 1));
     }
 
     _size /= 1024; // GB
-    return QString::number(_size, 'f', 2) + QLatin1Char(' ') + QObject::tr("GB");
+    return QObject::tr("%1 GB").arg(locale.toString(_size, 'f', 2));
 }
 
 QPixmap QzTools::createPixmapForSite(const QIcon &icon, const QString &title, const QString &url)