chore: translate i18n files (#7965)

Co-authored-by: JohnJyong <76649700+JohnJyong@users.noreply.github.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: Hanqing Zhao <sherry9277@gmail.com>
Co-authored-by: crazywoola <427733928@qq.com>

web/i18n/ja-JP/workflow.ts

@@ -416,6 +416,7 @@ const translation = {
       enterValue: '値を入力',
       addCondition: '条件を追加',
       conditionNotSetup: '条件が設定されていません',
+      selectVariable: '変数を選択...',
     },
     variableAssigner: {
       title: '変数を代入する',