Feature / user recommendation config in admin ui (#3357)

* add config for external user recommendation into admin ui

* debug

* correct admin ui

* switch external user recommendation to admin ui config

* debug

* debug

* debug

* Revert "debug"

This reverts commit f4a0460e5bde21cd1f39a735f496a2d74233ef3f.

* explicit parseInt radix

* add Japanese message

* change default engine to https

* remove unused settings

* debug

* nullable externalUserRecommendationTimeout

locales/ja-JP.yml

@@ -1117,6 +1117,12 @@ admin/views/instance.vue:
   invite: "招待"
   save: "保存"
   saved: "保存しました"
+  user-recommendation-config: "おすすめユーザー"
+  enable-external-user-recommendation: "外部ユーザーレコメンデーションを有効にする"
+  external-user-recommendation-engine: "エンジン"
+  external-user-recommendation-engine-desc: "例: https://vinayaka.distsn.org/cgi-bin/vinayaka-user-match-misskey-api.cgi?{{host}}+{{user}}+{{limit}}+{{offset}}"
+  external-user-recommendation-timeout: "タイムアウト"
+  external-user-recommendation-timeout-desc: "ミリ秒単位 (例: 300000)"
 
 admin/views/charts.vue:
   title: "チャート"