Add inside some create* methods the `setWhatsThis()` and `setToolTip()`
callings. That way the management of tooltips and “What's This” help is
facilitated.
Note: The parameter `const QString &toolTip` was already used in
KonfiguratorCheckBox *createCheckBox(QString configGroup, QString name, bool defaultValue,
QString text, QWidget *parent = nullptr, bool restart = false,
const QString &toolTip = QString(), int page = FIRST_PAGE);
A tooltip (related to Krusader lister) was added, with the text: //"If a text file
is bigger than this size then lister will be used"//. That tooltip is also useful
as an example and in order to perform tests with it.
GUI: A new translation string was added, which is visible on a tooltip and a “What's This” help.