---
title: Localization and import or export breaking changes
slug: cms-13/docs/localization-and-importexport-breaking-changes
docTags: 
createdAt: 2026-07-30T20:22:08.616Z
---

This article covers localization and import or export breaking changes in CMS 13.

## Localization provider for `/lang` folder

CMS no longer automatically registers a localization provider for the `/lang` folder. You should move to embedded language files instead.

## EPiServer.Framework.Localization.LocalizationService

- `LocalizationService` checks the invariant culture when configured as the `FallbackCulture`. Configure `FallbackBehavior` to skip checking fallback culture completely.
- The abstract `LoadString` and `GetAllStringsByCulture` methods now take a `ReadOnlyMemory<char>[]` parameter instead of `string[]`. These methods are abstract.
- The `NormalizeKey` method returns `ReadOnlyMemory<char>[]` and has replaced the `NormalizeKeyAsMemory` method.
- The `MissingMessageFormat` field was removed. Use the `GetMissingMessage` method to format a missing message string.

## EPiServer.Framework.Localization.LocalizationProvider

- The abstract `GetString` and `GetAllStrings` methods with `string[]` parameter were replaced with their equivalent methods taking a `ReadOnlyMemory<char>[]` parameter instead. These methods are abstract.

## EPiServer.Framework.Localization.ProviderBasedLocalizationService

- No longer implements `IConfigurableModule` and no longer registers as an `InitializableModule`.

## EPiServer.Framework.Localization.ResourceKeyNormalizedEventArgs

- The type of the `NormalizedKey` property and constructor argument was changed from `string[]` to `ReadOnlyMemory<char>[]`.

## EPiServer.Framework.Localization.CultureInfoExtensions

- The class with extension methods to `CultureInfo` was removed.

## EPiServer.Framework.Localization.LocalizationService (additional removals)

- Two protected virtual `TryGetStringByCulture` overloads (with `string[]` key parameters) were removed. Use the overloads with `ReadOnlyMemory<char>[]` parameters instead.

## EPiServer.Framework.Localization.ResourceKeyHandler (additional removals)

- Method `NormalizeKey` (returning `string[]`) was removed. Use `NormalizeKeyIntoMemory` instead.

## EPiServer.Enterprise

### Export changes

- `EPiServer.Enterprise.ExportEventArgs` – Property `ExportContext` was removed because only one export type exists. Constructor accepting `Type` argument that was used for `ExportContext` was removed.
- `EPiServer.Enterprise.ExportEventArgs.ContextOfExport` – Enum removed because there is only one type of export after the remaining mirroring functionality was removed.
- `EPiServer.Enterprise.ContentExportingEventArgs` – Constructor accepting `Type` argument that was used for `ExportContext` was removed.

### Import changes

- `EPiServer.Enterprise.IImportStatus` – Three new properties were added: `Content`, `Blueprints`, and `DisplayTemplates`. `DynamicPropertyDefinitions` was removed because it is no longer supported.

### Transfer context

- `EPiServer.Enterprise.Transfer.ITransferContext`
  - A new `DisplayTemplates` property was added.
  - `DeleteContent`, `DeleteContentLanguages`, `DeleteChildrenGuids`, and `MoveContent` were removed as mirroring is no longer supported.
  - Property `DynamicPropertyDefinitions` was removed. Dynamic Properties are no longer supported.
- `EPiServer.Enterprise.Transfer.TypeOfTransfer` – `MirroringImporting` and `MirroringExporting` were removed as mirroring is no longer supported.

### Dynamic Data Transfer

- `EPiServer.Enterprise.DynamicDataTransferHandler` – No longer implements the `IConfigurableModule` interface.

### Dynamic Properties in export/import

- `EPiServer.Enterprise.IDataExplorer.AddDynamicProperty` – Removed. Dynamic Properties are no longer supported.
- `EPiServer.Enterprise.IExportStatus.DynamicPropertyDefinitionsCount` – Removed. Dynamic Properties are no longer supported.

## EPiServer.LinkAnalyzer

- `EPiServer.LinkAnalyzer.LinkAnalyzerInitialization` – No longer implements the `IConfigurableModule` interface. Services are registered using the `AddCmsLinkAnalyzer()` service collection extension method.