String changes

src/calibre/gui2/dialogs/tag_editor.ui

@@ -149,7 +149,7 @@
           <string>Delete tag from database. This will unapply the tag from all books and then remove it from the database.</string>
          </property>
          <property name="text">
-          <string>Delete tag</string>
+          <string>&amp;Delete tag</string>
          </property>
          <property name="icon">
           <iconset resource="../../../../resources/images.qrc">
@@ -229,7 +229,7 @@
           <string>Unapply (remove) tag from current book</string>
          </property>
          <property name="text">
-          <string>Unapply tag</string>
+          <string>&amp;Unapply tag</string>
          </property>
          <property name="icon">
           <iconset resource="../../../../resources/images.qrc">

src/calibre/gui2/preferences/server.py

@@ -347,7 +347,7 @@ class NewUser(QDialog):
                     self,
                     _('Username already exists'),
                     _(
-                        'A user witht he username {} already exists. Please choose a different username.'
+                        'A user with the username {} already exists. Please choose a different username.'
                     ).format(un),
                     show=True
                 )