Make label showing fingerprint of key to certify accessible

GnuPG-bug-id: 6046

src/dialogs/certifywidget.cpp

@@ -276,6 +276,7 @@ public:
         auto mainLay = new QVBoxLayout{q};
 
         mFprLabel = new QLabel{q};
+        labelHelper.addLabel(mFprLabel);
         mainLay->addWidget(mFprLabel);
 
         auto secKeyLay = new QHBoxLayout;
@@ -644,6 +645,8 @@ public:
     KDateComboBox *mExpirationDateEdit = nullptr;
     QAction *mSetOwnerTrustAction = nullptr;
 
+    LabelHelper labelHelper;
+
     UserIDModel mUserIDModel;
     GpgME::Key mTarget;
 };