Add localization (#1482)

Co-authored-by: Tyrrrz <1935960+Tyrrrz@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

DiscordChatExporter.Gui/Utils/Extensions/MarkdigExtensions.cs

@@ -0,0 +1,19 @@
+using System.Linq;
+using Markdig.Syntax.Inlines;
+using MarkdownInline = Markdig.Syntax.Inlines.Inline;
+
+namespace DiscordChatExporter.Gui.Utils.Extensions;
+
+internal static class MarkdigExtensions
+{
+    extension(MarkdownInline inline)
+    {
+        public string GetInnerText() =>
+            inline switch
+            {
+                LiteralInline literal => literal.Content.ToString(),
+                ContainerInline container => string.Concat(container.Select(c => c.GetInnerText())),
+                _ => string.Empty,
+            };
+    }
+}