fixed label of the colors toolbar

src/board/UBBoardController.cpp

@@ -312,6 +312,7 @@ void UBBoardController::setupToolbar()
 
     UBToolbarButtonGroup *colorChoice =
             new UBToolbarButtonGroup(mMainWindow->boardToolBar, colorActions);
+    colorChoice->setLabel(tr("Color"));
 
     mMainWindow->boardToolBar->insertWidget(mMainWindow->actionBackgrounds, colorChoice);
 

src/gui/UBToolbarButtonGroup.cpp

@@ -102,6 +102,11 @@ UBToolbarButtonGroup::~UBToolbarButtonGroup()
     // NOOP
 }
 
+void UBToolbarButtonGroup::setLabel(const QString& label)
+{
+    mLabel = label;
+}
+
 void UBToolbarButtonGroup::setIcon(const QIcon &icon, int index)
 {
     Q_ASSERT(index < mActions.size());

src/gui/UBToolbarButtonGroup.h

@@ -48,6 +48,7 @@ class UBToolbarButtonGroup : public QWidget
         void setIcon(const QIcon &icon, int index);
         void setColor(const QColor &color, int index);
         int currentIndex() const;
+        void setLabel(const QString& label);
 
     protected:
         void paintEvent(QPaintEvent *);