[dbmanager] rename tree label to providers for clarity

python/plugins/db_manager/db_manager.py

@@ -393,7 +393,7 @@ def setupUi(self):
         self.layout.addWidget(self.infoBar, 0, 0, 1, 1)
 
         # create database tree
-        self.dock = QDockWidget(self.tr("Tree"), self)
+        self.dock = QDockWidget(self.tr("Providers"), self)
         self.dock.setObjectName("DB_Manager_DBView")
         self.dock.setFeatures(QDockWidget.DockWidgetMovable)
         self.tree = DBTree(self)