chore: Update translations (#11962)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/i18n/locale/ja/campaign.json

@@ -137,6 +137,70 @@
         }
       }
     },
+    "WHATSAPP": {
+      "HEADER_TITLE": "WhatsApp campaigns",
+      "NEW_CAMPAIGN": "キャンペーンを作成",
+      "EMPTY_STATE": {
+        "TITLE": "No WhatsApp campaigns are available",
+        "SUBTITLE": "Launch a WhatsApp campaign to reach your customers directly. Send offers or make announcements with ease. Click 'Create campaign' to get started."
+      },
+      "CARD": {
+        "STATUS": {
+          "COMPLETED": "完了",
+          "SCHEDULED": "スケジュール済み"
+        },
+        "CAMPAIGN_DETAILS": {
+          "SENT_FROM": "送信元",
+          "ON": "送信日"
+        }
+      },
+      "CREATE": {
+        "TITLE": "Create WhatsApp campaign",
+        "CANCEL_BUTTON_TEXT": "キャンセル",
+        "CREATE_BUTTON_TEXT": "作成",
+        "FORM": {
+          "TITLE": {
+            "LABEL": "タイトル",
+            "PLACEHOLDER": "キャンペーンのタイトルを入力してください",
+            "ERROR": "タイトルは必須です"
+          },
+          "INBOX": {
+            "LABEL": "受信トレイを選択",
+            "PLACEHOLDER": "受信トレイを選択",
+            "ERROR": "受信トレイは必須です"
+          },
+          "TEMPLATE": {
+            "LABEL": "WhatsApp Template",
+            "PLACEHOLDER": "Select a template",
+            "INFO": "Select a template to use for this campaign.",
+            "ERROR": "Template is required",
+            "PREVIEW_TITLE": "{templateName} を処理中",
+            "LANGUAGE": "言語",
+            "CATEGORY": "カテゴリ",
+            "VARIABLES_LABEL": "変数",
+            "VARIABLE_PLACEHOLDER": "Enter value for {variable}"
+          },
+          "AUDIENCE": {
+            "LABEL": "対象者",
+            "PLACEHOLDER": "顧客ラベルを選択",
+            "ERROR": "対象者は必須です"
+          },
+          "SCHEDULED_AT": {
+            "LABEL": "スケジュール時間",
+            "PLACEHOLDER": "時間を選択してください",
+            "ERROR": "スケジュール時間は必須です"
+          },
+          "BUTTONS": {
+            "CREATE": "作成",
+            "CANCEL": "キャンセル"
+          },
+          "API": {
+            "SUCCESS_MESSAGE": "WhatsApp campaign created successfully",
+            "ERROR_MESSAGE": "エラーが発生しました。もう一度お試しください。"
+          }
+        }
+      }
+    },
     "CONFIRM_DELETE": {
       "TITLE": "削除の確認",
       "DESCRIPTION": "削除操作は永久的で、元に戻すことはできません。",