diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index 33f6e3122a..336f5d3c1f 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -398,7 +398,7 @@ def get_version():
 def get_appname_for_display():
     ans = __appname__
     if isportable:
-        ans = _('{} portable').format(ans)
+        ans = _('{} Portable').format(ans)
     return ans
 
 
diff --git a/src/calibre/gui2/actions/store.py b/src/calibre/gui2/actions/store.py
index 0f316160b7..64d4715ac6 100644
--- a/src/calibre/gui2/actions/store.py
+++ b/src/calibre/gui2/actions/store.py
@@ -134,7 +134,7 @@ class StoreAction(InterfaceAction):
         confirm(('<p>' +
             _('calibre helps you find the e-books you want by searching '
             'the websites of various commercial and public domain '
-            'book sources for you.') +
+            'book sources.') +
             '<p>' +
             _('Using the integrated search you can easily find which '
             'store has the book you are looking for, at the best price. '
diff --git a/src/calibre/gui2/dialogs/tag_categories.ui b/src/calibre/gui2/dialogs/tag_categories.ui
index c49bb95de0..d878c94e0c 100644
--- a/src/calibre/gui2/dialogs/tag_categories.ui
+++ b/src/calibre/gui2/dialogs/tag_categories.ui
@@ -248,7 +248,7 @@
      <item row="3" column="3">
       <widget class="QToolButton" name="unapply_button">
        <property name="toolTip">
-        <string>Unapply (remove) tag from current tag category</string>
+        <string>Unapply (remove) selected tags from current tag category</string>
        </property>
        <property name="text">
         <string>...</string>
diff --git a/src/calibre/utils/formatter_functions.py b/src/calibre/utils/formatter_functions.py
index 5ff60a0d7f..3264fbfb7c 100644
--- a/src/calibre/utils/formatter_functions.py
+++ b/src/calibre/utils/formatter_functions.py
@@ -2028,7 +2028,7 @@ class BuiltinCharacter(BuiltinFormatterFunction):
     category = 'String manipulation'
     __doc__ = doc = _('character(character_name) -- returns the '
                       'character named by character_name. For example, '
-                      "character('newline') returns a newline character ('\n'). "
+                      r"character('newline') returns a newline character ('\n'). "
                       "The supported character names are 'newline', 'return', "
                       "'tab', and 'backslash'.")