diff --git a/src/calibre/ebooks/conversion/plugins/epub_input.py b/src/calibre/ebooks/conversion/plugins/epub_input.py
index 7d5bf6cca0..2e599e0002 100644
--- a/src/calibre/ebooks/conversion/plugins/epub_input.py
+++ b/src/calibre/ebooks/conversion/plugins/epub_input.py
@@ -132,7 +132,7 @@ class EPUBInput(InputFormatPlugin):
         if titlepage_href is None:
             titlepage_href, titlepage_id = guide_titlepage_href, guide_titlepage_id
         if titlepage_href is not None:
-            self.set_guide_type(opf, 'titlepage', titlepage_href, 'Title Page')
+            self.set_guide_type(opf, 'titlepage', titlepage_href, 'Title page')
             spine = list(opf.iterspine())
             if len(spine) > 1:
                 for item in spine:
@@ -227,7 +227,7 @@ class EPUBInput(InputFormatPlugin):
                         f.write(renderer)
 
         # Set the titlepage guide entry
-        self.set_guide_type(opf, 'titlepage', guide_cover, 'Title Page')
+        self.set_guide_type(opf, 'titlepage', guide_cover, 'Title page')
         return removed
 
     def find_opf(self):
diff --git a/src/calibre/ebooks/oeb/transforms/cover.py b/src/calibre/ebooks/oeb/transforms/cover.py
index b36c4c6362..d93141f577 100644
--- a/src/calibre/ebooks/oeb/transforms/cover.py
+++ b/src/calibre/ebooks/oeb/transforms/cover.py
@@ -163,7 +163,7 @@ class CoverManager(object):
         if item is not None:
             self.oeb.spine.insert(0, item, True)
             if 'cover' not in self.oeb.guide.refs:
-                self.oeb.guide.add('cover', 'Title Page', 'a')
+                self.oeb.guide.add('cover', 'Title page', 'a')
             self.oeb.guide.refs['cover'].href = item.href
             if 'titlepage' in self.oeb.guide.refs:
                 self.oeb.guide.refs['titlepage'].href = item.href
diff --git a/src/calibre/gui2/dialogs/tag_categories.py b/src/calibre/gui2/dialogs/tag_categories.py
index 6dc7caf606..30814c3140 100644
--- a/src/calibre/gui2/dialogs/tag_categories.py
+++ b/src/calibre/gui2/dialogs/tag_categories.py
@@ -288,7 +288,7 @@ class TagCategories(QDialog, Ui_TagCategories):
 
     def del_category(self):
         if self.current_cat_name is not None:
-            if not confirm('<p>'+_('The current user category will be '
+            if not confirm('<p>'+_('The current User category will be '
                            '<b>permanently deleted</b>. Are you sure?') +
                            '</p>', 'tag_category_delete', self):
                 return
diff --git a/src/calibre/gui2/dialogs/tag_categories.ui b/src/calibre/gui2/dialogs/tag_categories.ui
index e7287098fb..3ab5148ac7 100644
--- a/src/calibre/gui2/dialogs/tag_categories.ui
+++ b/src/calibre/gui2/dialogs/tag_categories.ui
@@ -121,7 +121,7 @@
        <item row="0" column="0">
         <widget class="QToolButton" name="delete_category_button">
          <property name="toolTip">
-          <string>Delete the current user category</string>
+          <string>Delete the current User category</string>
          </property>
          <property name="text">
           <string>...</string>
@@ -225,7 +225,7 @@
      <item row="3" column="1">
       <widget class="QToolButton" name="apply_button">
        <property name="toolTip">
-        <string>Apply tags to current tag category</string>
+        <string>Apply items to current category</string>
        </property>
        <property name="text">
         <string>...</string>
@@ -259,7 +259,7 @@
      <item row="3" column="3">
       <widget class="QToolButton" name="unapply_button">
        <property name="toolTip">
-        <string>Unapply (remove) selected tags from current tag category</string>
+        <string>Unapply (remove) selected items from current category</string>
        </property>
        <property name="text">
         <string>...</string>
diff --git a/src/calibre/gui2/library/annotations.py b/src/calibre/gui2/library/annotations.py
index 1ef6673b0c..78a0e2c0a0 100644
--- a/src/calibre/gui2/library/annotations.py
+++ b/src/calibre/gui2/library/annotations.py
@@ -506,7 +506,7 @@ class Restrictions(QWidget):
         v.addLayout(h)
         self.rla = QLabel(_('Restrict to') + ': ')
         h.addWidget(self.rla)
-        la = QLabel(_('Types:'))
+        la = QLabel(_('Type:'))
         h.addWidget(la)
         self.types_box = tb = QComboBox(self)
         tb.la = la
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index b734ac5581..e93a359ee3 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -803,7 +803,7 @@ class InsertSemantics(Dialog):
     def create_known_type_map(self):
         _ = lambda x: x
         self.known_type_map = {
-            'title-page': _('Title Page'),
+            'title-page': _('Title page'),
             'toc': _('Table of Contents'),
             'index': _('Index'),
             'glossary': _('Glossary'),
diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index 9694302e65..0dcb1267c2 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -134,7 +134,7 @@ View an e-book.
         'If you want to match a substring, use the form toc-href-contains:something. '
         'The form ref:something will use Reference mode references.'))
     a('--continue', default=False, action='store_true', dest='continue_reading',
-        help=_('Continue reading at the previously opened book'))
+        help=_('Continue reading the previously opened book'))
 
     setup_gui_option_parser(parser)
     return parser