chore: improve the copywrite of the assigner node append mode description (#7467)

web/i18n/en-US/workflow.ts

@@ -440,7 +440,7 @@ const translation = {
     assigner: {
       'assignedVariable': 'Assigned Variable',
       'writeMode': 'Write Mode',
-      'writeModeTip': 'When ASSIGNED VARIABLE is an array, append mode adds to the end.',
+      'writeModeTip': 'Append mode: Available for array variables only.',
       'over-write': 'Overwrite',
       'append': 'Append',
       'plus': 'Plus',

web/i18n/zh-Hans/workflow.ts

@@ -440,7 +440,7 @@ const translation = {
     assigner: {
       'assignedVariable': '赋值的变量',
       'writeMode': '写入模式',
-      'writeModeTip': '赋值的变量为数组时，可添加变量至数组末尾。',
+      'writeModeTip': '使用追加模式时，赋值的变量必须是数组类型。',
       'over-write': '覆盖',
       'append': '追加',
       'plus': '加',