Localized all relevant numbers visible to end-user (#2488)

src/util/Helpers.cpp

@@ -1,5 +1,6 @@
 #include "Helpers.hpp"
 
+#include <QLocale>
 #include <QUuid>
 
 namespace chatterino {
@@ -35,4 +36,10 @@ QString shortenString(const QString &str, unsigned maxWidth)
     return shortened;
 }
 
+QString localizeNumbers(const int &number)
+{
+    QLocale locale;
+    return locale.toString(number);
+}
+
 }  // namespace chatterino