feat: add localization. add realtime derivation of period from hour in NeedConfirm mode.

src/Ursa.Themes.Semi/Controls/TimePicker.axaml

@@ -199,7 +199,7 @@
                                                 Margin="8"
                                                 HorizontalAlignment="Right"
                                                 Command="{Binding $parent[u:TimePicker].Confirm}"
-                                                Content="Confirm" />
+                                                Content="{DynamicResource STRING_DATE_TIME_CONFIRM}" />
                                         </StackPanel>
                                         <ContentPresenter
                                             Name="PART_PopupHeader"

src/Ursa.Themes.Semi/Locale/en-us.axaml

@@ -15,4 +15,5 @@
     <x:String x:Key="STRING_THEME_TOGGLE_DARK">Dark</x:String>
     <x:String x:Key="STRING_THEME_TOGGLE_LIGHT">Light</x:String>
     <x:String x:Key="STRING_THEME_TOGGLE_SYSTEM">System</x:String>
+    <x:String x:Key="STRING_DATE_TIME_CONFIRM">Confirm</x:String>   
 </ResourceDictionary>

src/Ursa.Themes.Semi/Locale/zh-cn.axaml

@@ -15,4 +15,5 @@
     <x:String x:Key="STRING_THEME_TOGGLE_DARK">暗色</x:String>
     <x:String x:Key="STRING_THEME_TOGGLE_LIGHT">亮色</x:String>
     <x:String x:Key="STRING_THEME_TOGGLE_SYSTEM">跟随系统</x:String>
+    <x:String x:Key="STRING_DATE_TIME_CONFIRM">确认</x:String>   
 </ResourceDictionary>