Avalonia: Move LocaleExtension & IconExtension into one namespace to simplify the usage sites in the markup.

src/Ryujinx/UI/Views/User/UserSelectorView.axaml

@@ -2,7 +2,7 @@
     x:Class="Ryujinx.Ava.UI.Views.User.UserSelectorViews"
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:locale="clr-namespace:Ryujinx.Ava.Common.Locale"
+    xmlns:ext="clr-namespace:Ryujinx.Ava.Common.Markup"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:helpers="clr-namespace:Ryujinx.Ava.UI.Helpers"
@@ -144,10 +144,10 @@
             Spacing="10">
             <Button
                 Click="ManageSaves"
-                Content="{locale:Locale UserProfilesManageSaves}" />
+                Content="{ext:Locale UserProfilesManageSaves}" />
             <Button
                 Click="RecoverLostAccounts"
-                Content="{locale:Locale UserProfilesRecoverLostAccounts}" />
+                Content="{ext:Locale UserProfilesRecoverLostAccounts}" />
         </StackPanel>
         <StackPanel
             Grid.Row="1"
@@ -156,7 +156,7 @@
             Orientation="Horizontal">
             <Button
                 Click="Close"
-                Content="{locale:Locale UserProfilesClose}" />
+                Content="{ext:Locale UserProfilesClose}" />
         </StackPanel>
     </Grid>
 </UserControl>