[Update] - Add Ukrainian localization and make minimal stylistic adjustments to other localization files.

src/Semi.Avalonia/Locale/en-us.axaml

@@ -1,5 +1,6 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
+<ResourceDictionary
     x:Class="Semi.Avalonia.Locale.en_us"
+    xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  DatePicker  -->
     <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">day</x:String>

src/Semi.Avalonia/Locale/ja-jp.axaml

@@ -1,5 +1,6 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
+<ResourceDictionary
     x:Class="Semi.Avalonia.Locale.ja_jp"
+    xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  DatePicker  -->
     <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">日</x:String>

src/Semi.Avalonia/Locale/ru-ru.axaml

@@ -1,5 +1,6 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
+<ResourceDictionary
     x:Class="Semi.Avalonia.Locale.ru_ru"
+    xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  DatePicker  -->
     <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">день</x:String>

src/Semi.Avalonia/Locale/uk-uk.axaml

@@ -0,0 +1,27 @@
+<ResourceDictionary
+    x:Class="Semi.Avalonia.Locale.uk_uk"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  DatePicker  -->
+    <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">день</x:String>
+    <x:String x:Key="STRING_DATEPICKER_MONTH_TEXT">місяць</x:String>
+    <x:String x:Key="STRING_DATEPICKER_YEAR_TEXT">рік</x:String>
+    <!--  TimePicker  -->
+    <x:String x:Key="STRING_TIMEPICKER_HOUR_TEXT">години</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_MINUTE_TEXT">хвилини</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_SECOND_TEXT">секунди</x:String>
+    <!--  TextBox/SelectableTextBox flyout  -->
+    <x:String x:Key="STRING_MENU_CUT">Вирізати</x:String>
+    <x:String x:Key="STRING_MENU_COPY">Копіювати</x:String>
+    <x:String x:Key="STRING_MENU_PASTE">Вставити</x:String>
+    <!--  ManagedFileChooser  -->
+    <x:String x:Key="STRING_CHOOSER_FILE_NAME">Ім'я файлу</x:String>
+    <x:String x:Key="STRING_CHOOSER_SHOW_HIDDEN_FILES">Показати приховані папки</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_OK">ОК</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_CANCEL">Відмінити</x:String>
+    <x:String x:Key="STRING_CHOOSER_NAME_COLUMN">Ім'я</x:String>
+    <x:String x:Key="STRING_CHOOSER_DATEMODIFIED_COLUMN">Дата редагування</x:String>
+    <x:String x:Key="STRING_CHOOSER_TYPE_COLUMN">Тип</x:String>
+    <x:String x:Key="STRING_CHOOSER_SIZE_COLUMN">Розмір</x:String>
+    <x:String x:Key="STRING_CHOOSER_PROMPT_FILE_ALREADY_EXISTS">{0} уже існує. Ви бажаєте замінити його?</x:String>
+</ResourceDictionary>

src/Semi.Avalonia/Locale/uk-uk.axaml.cs

@@ -0,0 +1,8 @@
+using Avalonia.Controls;
+
+namespace Semi.Avalonia.Locale;
+
+public class uk_uk : ResourceDictionary
+{
+    
+}

src/Semi.Avalonia/Locale/zh-cn.axaml

@@ -1,5 +1,6 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
+<ResourceDictionary
     x:Class="Semi.Avalonia.Locale.zh_cn"
+    xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  DatePicker  -->
     <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">日</x:String>

src/Semi.Avalonia/Themes/SemiTheme.axaml.cs

@@ -20,6 +20,7 @@ public class SemiTheme : Styles
         { new CultureInfo("zh-cn"), new zh_cn() },
         { new CultureInfo("en-us"), new en_us() },
         { new CultureInfo("ja-jp"), new ja_jp() },
+        { new CultureInfo("uk-uk"), new uk_uk() },
         { new CultureInfo("ru-ru"), new ru_ru() },
     };