improve the label for NotCreatablePage

apps/app/public/static/locales/en_US/translation.json

@@ -165,7 +165,7 @@
   "folder_name": "Folder name",
   "field": "field",
   "not_creatable_page": {
-    "could_not_creata_path": "Couldn't create path."
+    "message": "Page contents cannot be created in this path."
   },
   "custom_navigation": {
     "no_pages_under_this_page": "There are no pages under this page."

apps/app/public/static/locales/ja_JP/translation.json

@@ -166,7 +166,7 @@
   "folder_name": "フォルダ名",
   "field": "フィールド",
   "not_creatable_page": {
-    "could_not_creata_path": "パスを作成できませんでした。"
+    "message": "このパスではページ コンテンツを作成できません。"
   },
   "custom_navigation": {
     "no_pages_under_this_page": "このページの配下にはページが存在しません。"

apps/app/public/static/locales/zh_CN/translation.json

@@ -172,7 +172,7 @@
   "folder_name": "文件夹名称",
   "field": "字段",
   "not_creatable_page": {
-    "could_not_creata_path": "无法创建路径"
+    "message": "无法在此路径中创建页面内容。"
   },
   "custom_navigation": {
     "no_pages_under_this_page": "There are no pages under this page."

apps/app/src/components/NotCreatablePage.tsx

@@ -10,7 +10,7 @@ export const NotCreatablePage: FC = () => {
       <div className="col-md-12">
         <h2 className="text-muted">
           <i className="icon-ban mr-1" aria-hidden="true"></i>
-          { t('not_creatable_page.could_not_creata_path') }
+          { t('not_creatable_page.message') }
         </h2>
       </div>
     </div>