Made events nullable

I18N Commander/UI WinForms/AppEvents.cs

@@ -6,7 +6,7 @@ internal static class AppEvents
 {
     #region Event: Settings were 
     
-    internal static event EventHandler WhenSettingsChanged;
+    internal static event EventHandler? WhenSettingsChanged;
     
     internal static void SettingsChanged() => WhenSettingsChanged?.Invoke(null, EventArgs.Empty);
 
@@ -15,7 +15,7 @@ internal static class AppEvents
     #region Event: Section was changed
 
     // Section changed event which can be subscribed:
-    internal static event EventHandler<Section> WhenSectionChanged;
+    internal static event EventHandler<Section>? WhenSectionChanged;
     
     // Method to raise the section changed event:
     internal static void SectionChanged(Section section) => WhenSectionChanged?.Invoke(null, section);
@@ -25,7 +25,7 @@ internal static class AppEvents
     #region Event: Text element was changed
 
     // Text element changed event which can be subscribed:
-    internal static event EventHandler<TextElement?> WhenTextElementChanged;
+    internal static event EventHandler<TextElement?>? WhenTextElementChanged;
     
     // Method to raise the text element changed event:
     internal static void TextElementChanged(TextElement? textElement) => WhenTextElementChanged?.Invoke(null, textElement);
@@ -35,7 +35,7 @@ internal static class AppEvents
     #region Translation was changed
 
     // Translation changed event which can be subscribed:
-    internal static event EventHandler<Translation?> WhenTranslationChanged;
+    internal static event EventHandler<Translation?>? WhenTranslationChanged;
     
     // Method to raise the translation changed event:
     internal static void TranslationChanged(Translation? translation) => WhenTranslationChanged?.Invoke(null, translation);