diff --git a/src/calibre/gui2/custom_column_widgets.py b/src/calibre/gui2/custom_column_widgets.py
index 7d941b92ba..a907970fcc 100644
--- a/src/calibre/gui2/custom_column_widgets.py
+++ b/src/calibre/gui2/custom_column_widgets.py
@@ -417,7 +417,7 @@ def __init__(self, parent):
         self.tags_box = EditWithComplete(parent)
         layout.addWidget(self.tags_box, stretch=1000)
         self.editor_button = QToolButton(self)
-        self.editor_button.setToolTip(_('Open Item Editor'))
+        self.editor_button.setToolTip(_('Open item editor'))
         self.editor_button.setIcon(QIcon(I('chapters.png')))
         layout.addWidget(self.editor_button)
         self.setLayout(layout)
@@ -882,7 +882,7 @@ def make_widgets(self, parent, main_widget_class, extra_label_text='',
         l.setStretchFactor(self.main_widget, 10)
         if add_tags_edit_button:
             self.edit_tags_button = QToolButton(parent)
-            self.edit_tags_button.setToolTip(_('Open Item Editor'))
+            self.edit_tags_button.setToolTip(_('Open item editor'))
             self.edit_tags_button.setIcon(QIcon(I('chapters.png')))
             l.addWidget(self.edit_tags_button)
         self.a_c_checkbox = QCheckBox(_('Apply changes'), w)
@@ -1273,7 +1273,7 @@ def __init__(self, parent, values):
         self.tags_box.update_items_cache(values)
         layout.addWidget(self.tags_box, stretch=3)
         self.remove_tags_button = QToolButton(parent)
-        self.remove_tags_button.setToolTip(_('Open Item Editor'))
+        self.remove_tags_button.setToolTip(_('Open item editor'))
         self.remove_tags_button.setIcon(QIcon(I('chapters.png')))
         layout.addWidget(self.remove_tags_button)
         self.checkbox = QCheckBox(_('Remove all tags'), parent)