minor fix

MySolution/ToDoApp/MainWindow.xaml

@@ -67,9 +67,9 @@
             </Grid.RowDefinitions>
 
             <StackPanel Grid.Row="0" Orientation="Vertical" Margin="5">
-                <subcontrol:PlaceholderTextBox x:Name="tbxItemName" VerticalAlignment="Center" TPlaceholder="이름" TForeground="Black" THeight="40"
+                <subcontrol:PlaceholderTextBox x:Name="tbxItemName" VerticalAlignment="Center" TPlaceholder="할 일" TForeground="Black" THeight="40"
                    TFontWeight="Bold" TFontSize="20"/>
-                <TextBlock x:Name="tbItemCreatedAt" Text="0000년 00월 00일 0요일 생성됨" Foreground="Gray" TextAlignment="Right"/>
+                <TextBlock x:Name="tbItemCreatedAt" Foreground="Gray" TextAlignment="Right"/>
                 <StackPanel Orientation="Horizontal" Margin="0 5 0 0">
                     <CheckBox x:Name="chkItemToday" Background="Transparent"/>
                     <TextBlock Text="나의 하루에 추가" Margin="10 0 0 0" Background="Transparent"/>