FIX(a11y): Explicitly set the accessible name of "Next" and "Back" buttons in wizards

For some or all screen readers the "Next >" and "Back <" buttons
in wizards read out the ">" and "<" symbols which is rather annoying.

This commit explicitly sets the accessible name attribute such that
the buttons are read without the symbols.

src/mumble/Accessibility.cpp

@@ -5,6 +5,9 @@
 
 #include "Accessibility.h"
 
+#include <QAbstractButton>
+#include <QObject>
+
 namespace Mumble {
 namespace Accessibility {
 
@@ -12,5 +15,10 @@ namespace Accessibility {
 		widget->setAccessibleDescription(label->text().remove(QRegExp("<[^>]*>")));
 	}
 
+	void fixWizardButtonLabels(QWizard *wizard) {
+		wizard->button(QWizard::NextButton)->setAccessibleName(QObject::tr("Next"));
+		wizard->button(QWizard::BackButton)->setAccessibleName(QObject::tr("Back"));
+	}
+
 } // namespace Accessibility
 } // namespace Mumble

src/mumble/Accessibility.h

@@ -8,11 +8,13 @@
 
 #include <QLabel>
 #include <QWidget>
+#include <QWizard>
 
 namespace Mumble {
 namespace Accessibility {
 
 	void setDescriptionFromLabel(QWidget *widget, const QLabel *label);
+	void fixWizardButtonLabels(QWizard *wizard);
 
 } // namespace Accessibility
 } // namespace Mumble

src/mumble/AudioWizard.cpp

@@ -38,6 +38,8 @@ AudioWizard::AudioWizard(QWidget *p) : QWizard(p) {
 	qsMaxAmp->setAccessibleName(tr("Maximum amplification"));
 	qsVAD->setAccessibleName(tr("VAD level"));
 
+	Mumble::Accessibility::fixWizardButtonLabels(this);
+
 	Mumble::Accessibility::setDescriptionFromLabel(qrbQualityLow, qlQualityLow);
 	Mumble::Accessibility::setDescriptionFromLabel(qrbQualityBalanced, qlQualityBalanced);
 	Mumble::Accessibility::setDescriptionFromLabel(qrbQualityUltra, qlQualityUltra);

src/mumble/Cert.cpp

@@ -13,6 +13,7 @@
 
 #include "Cert.h"
 
+#include "Accessibility.h"
 #include "SelfSignedCertificate.h"
 #include "Utils.h"
 #include "Global.h"
@@ -131,6 +132,8 @@ CertWizard::CertWizard(QWidget *p) : QWizard(p) {
 	qleEmail->setAccessibleName(tr("Email address"));
 	qleName->setAccessibleName(tr("Your name"));
 
+	Mumble::Accessibility::fixWizardButtonLabels(this);
+
 	setOption(QWizard::NoCancelButton, false);
 
 	qwpExport->setCommitPage(true);