fix(plugin-import-export): plugin breaks i18n configuration (#11590)

Fixes #11582

Author: r1tsuu

.github/workflows/pr-title.yml

@@ -53,6 +53,7 @@ jobs:
             plugin-cloud
             plugin-cloud-storage
             plugin-form-builder
+            plugin-import-export
             plugin-multi-tenant
             plugin-nested-docs
             plugin-redirects

packages/plugin-import-export/src/index.ts

@@ -66,7 +66,11 @@ export const importExportPlugin =
       collection.admin.components = components
     })
 
-    config.i18n = deepMergeSimple(translations, config.i18n?.translations ?? {})
+    if (!config.i18n) {
+      config.i18n = {}
+    }
+
+    config.i18n.translations = deepMergeSimple(translations, config.i18n?.translations ?? {})
 
     return config
   }