fix(installer): localize context submenu failure messages

scripts/installer-migration.iss

@@ -384,7 +384,7 @@ begin
   Menu := Root + '\PebrelWslMenu';
   { Never overwrite an unknown installation or an edited submenu. }
   if RegKeyExists(HKCU, Menu) and not IsOwnedWslMenu(Menu, Executable) then
-    RaiseException('An unowned or edited WSL context menu was preserved: ' + Menu);
+    RaiseException(FmtMessage(CustomMessage('WslMenuConflict'), [Menu]));
   RemoveOwnedWslContextMenusAt(Root, Executable);
   if GetArrayLength(Distros) = 0 then
     Exit;
@@ -392,7 +392,7 @@ begin
     not RegWriteStringValue(HKCU, Menu, 'Icon', Executable + ',0') or
     not RegWriteStringValue(HKCU, Menu, 'SubCommands', '') or
     not RegWriteStringValue(HKCU, Menu, 'PebrelOwner', Executable) then
-    RaiseException('Unable to register the WSL context submenu.');
+    RaiseException(CustomMessage('WslMenuRegistrationFailed'));
   for Index := 0 to GetArrayLength(Distros) - 1 do begin
     Distro := Distros[Index];
     { 键名用序号而不是发行版名：注册表键名里带空格与非 ASCII 只会给自己找麻烦，

scripts/installer.iss

@@ -78,6 +78,8 @@ english.InstallFont=Install Maple Mono font for the current user
 english.AddToPath=Add Pebrel to the user PATH
 english.OpenInPebrel=Open in Pebrel
 english.OpenInPebrelWsl=Open in Pebrel (WSL)
+english.WslMenuConflict=An existing WSL submenu belongs to another installation or was edited, so it was preserved: %1.
+english.WslMenuRegistrationFailed=Unable to register the WSL context submenu.
 english.LaunchProgram=Launch Pebrel
 english.UninstallProgram=Uninstall Pebrel
 english.CloseLegacyProgram=Close the application at %1, then retry the installation.
@@ -90,6 +92,8 @@ chinesesimplified.InstallFont=为当前用户安装 Maple Mono 字体
 chinesesimplified.AddToPath=将 Pebrel 添加到当前用户 PATH
 chinesesimplified.OpenInPebrel=在 Pebrel 中打开
 chinesesimplified.OpenInPebrelWsl=在 Pebrel 中打开（WSL）
+chinesesimplified.WslMenuConflict=现有 WSL 子菜单属于其他安装或已被修改，因此已保留：%1。
+chinesesimplified.WslMenuRegistrationFailed=无法注册 WSL 右键子菜单。
 chinesesimplified.LaunchProgram=启动 Pebrel
 chinesesimplified.UninstallProgram=卸载 Pebrel
 chinesesimplified.CloseLegacyProgram=请关闭 %1 中运行的程序，然后重试安装。

scripts/tests/installer-migration-fixture.iss

@@ -17,6 +17,8 @@ SetupLogging=no
 
 [CustomMessages]
 OpenInPebrelWsl=Open in Pebrel (WSL)
+WslMenuConflict=Preserved an edited or foreign submenu: %1.
+WslMenuRegistrationFailed=Unable to register the WSL context submenu.
 
 [Code]
 #include "..\installer-migration.iss"