add locale string "mutuals"

locales/en-US.yml

@@ -88,6 +88,7 @@ note: "Note"
 notes: "Notes"
 following: "Following"
 followers: "Followers"
+mutuals: "Mutuals"
 followsYou: "Follows you"
 createList: "Create list"
 manageLists: "Manage lists"

locales/index.d.ts

@@ -368,6 +368,10 @@ export interface Locale extends ILocale {
      * フォロワー
      */
     "followers": string;
+    /**
+     * Mutuals
+     */
+    "mutuals": string;
     /**
      * フォローされています
      */

locales/ja-JP.yml

@@ -88,6 +88,7 @@ note: "ノート"
 notes: "ノート"
 following: "フォロー"
 followers: "フォロワー"
+mutuals: "Mutuals"
 followsYou: "フォローされています"
 createList: "リスト作成"
 manageLists: "リストの管理"