[welcome] Use about-message from Config

- for QML, this is the easiest way to factor out the message
  (no convenient access to free functions, unless I bung the
  message into e.g. Branding where I don't think it fits
  very well).

src/modules/welcome/Config.cpp

@@ -10,6 +10,7 @@
 #include "Config.h"
 
 #include "Branding.h"
+#include "CalamaresAbout.h"
 #include "GlobalStorage.h"
 #include "JobQueue.h"
 #include "Settings.h"
@@ -247,6 +248,13 @@ Config::setSupportUrl( const QString& url )
     emit supportUrlChanged();
 }
 
+QString
+Config::aboutMessage() const
+{
+    return Calamares::aboutString();
+}
+
+
 QString
 Config::genericWelcomeMessage() const
 {

src/modules/welcome/Config.h

@@ -52,6 +52,7 @@ class Config : public QObject
     Q_PROPERTY( QString countryCode MEMBER m_countryCode NOTIFY countryCodeChanged FINAL )
     Q_PROPERTY( int localeIndex READ localeIndex WRITE setLocaleIndex NOTIFY localeIndexChanged )
 
+    Q_PROPERTY( QString aboutMessage READ aboutMessage CONSTANT FINAL )
     Q_PROPERTY( QString genericWelcomeMessage MEMBER m_genericWelcomeMessage NOTIFY genericWelcomeMessageChanged FINAL )
     Q_PROPERTY( QString warningMessage READ warningMessage NOTIFY warningMessageChanged FINAL )
 
@@ -89,6 +90,7 @@ public:
     QString donateUrl() const { return m_donateUrl; }
     void setDonateUrl( const QString& url );
 
+    QString aboutMessage() const;
     QString genericWelcomeMessage() const;
     QString warningMessage() const;
 

src/modules/welcome/WelcomePage.cpp

@@ -223,7 +223,7 @@ WelcomePage::showAboutBox()
         = Calamares::Settings::instance()->isSetupMode() ? tr( "About %1 setup" ) : tr( "About %1 installer" );
     QMessageBox mb( QMessageBox::Information,
                     title.arg( CALAMARES_APPLICATION_NAME ),
-                    Calamares::aboutString().arg( Calamares::Branding::instance()->versionedName() ),
+                    m_conf->aboutMessage().arg( Calamares::Branding::instance()->versionedName() ),
                     QMessageBox::Ok,
                     this );
     Calamares::fixButtonLabels( &mb );

src/modules/welcomeq/about.qml

@@ -18,9 +18,6 @@ Item {
     height: parent.height
     focus: true
 
-    property var appName: "Calamares"
-    property var appVersion: "3.2.24"
-
     Rectangle {
         id: textArea
         x: 28
@@ -44,21 +41,7 @@ Item {
                     width: 400
                     height: 250
                     anchors.centerIn: parent
-                    text: qsTr("<h1>%1</h1><br/>
-                        <strong>%2<br/>
-                        for %3</strong><br/><br/>
-                        Copyright 2014-2017 Teo Mrnjavac &lt;teo@kde.org&gt;<br/>
-                        Copyright 2017-2020 Adriaan de Groot &lt;groot@kde.org&gt;<br/>
-                        Thanks to <a href='https://calamares.io/team/'>the Calamares team</a>
-                        and the <a href='https://www.transifex.com/calamares/calamares/'>Calamares
-                        translators team</a>.<br/><br/>
-                        <a href='https://calamares.io/'>Calamares</a>
-                        development is sponsored by <br/>
-                        <a href='http://www.blue-systems.com/'>Blue Systems</a> -
-                        Liberating Software." )
-                        .arg(appName)
-                        .arg(appVersion)
-                        .arg(Branding.string(Branding.VersionedName))
+                    text: config.aboutMessage.arg(Branding.string(Branding.VersionedName))
 
                         onLinkActivated: Qt.openUrlExternally(link)