improve sync conflict message

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

@@ -1064,7 +1064,7 @@
     "update_sync_settings_failed": "Failed to update sync settings",
     "description_form_detail": "Please note that edited value will be overwritten on next sync if description mapper is set in sync settings",
     "only_description_edit_allowed": "Only description can be edited for external user groups",
-    "sync_being_executed": "Cannot execute sync until current external group sync process finishes",
+    "sync_being_executed": "There is a running external group sync process started by you or another user. The next sync cannot be executed until this finishes.",
     "sync_succeeded": "Sync succeeded",
     "sync_failed": "Sync failed",
     "ldap": {

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

@@ -1073,7 +1073,7 @@
     "update_sync_settings_failed": "同期設定の更新が失敗しました",
     "description_form_detail": "同期設定で「説明」の mapper が設定されている場合、編集内容は再同期によって上書きされることに注意してください",
     "only_description_edit_allowed": "外部グループは説明の編集のみが可能です",
-    "sync_being_executed": "現在実行されている外部グループ同期が終わるまで次の実行ができません",
+    "sync_being_executed": "自身または他のユーザが実行した外部グループの同期が実行されており、これが終わるまで次の実行ができません",
     "sync_succeeded": "同期に成功しました",
     "sync_failed": "同期に失敗しました",
     "ldap": {

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

@@ -1072,7 +1072,7 @@
     "update_sync_settings_failed": "Failed to update sync settings",
     "description_form_detail": "Please note that edited value will be overwritten on next sync if description mapper is set in sync settings",
     "only_description_edit_allowed": "Only description can be edited for external user groups",
-    "sync_being_executed": "Cannot execute sync until current external group sync process finishes",
+    "sync_being_executed": "There is a running external group sync process started by you or another user. The next sync cannot be executed until this finishes.",
     "sync_succeeded": "Sync succeeded",
     "sync_failed": "Sync failed",
     "ldap": {