feat: Add campaign (#2177)

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

@@ -1,9 +1,49 @@
 {
   "CAMPAIGN": {
     "HEADER": "Campaigns",
-    "HEADER_BTN_TXT": "Create Campaign",
+    "SIDEBAR_TXT": "Proactive messages allow the customer to send outbound messages to their contacts which would trigger more conversations. Click on <b>Add Campaign</b> to create a new campaign. You can also edit or delete an existing campaign by clicking on the Edit or Delete button.",
+    "HEADER_BTN_TXT": "Create a campaign",
     "LIST": {
-      "404": "There are no campaigns attached to this inbox"
+      "404": "There are no campaigns created for this inbox."
+    },
+    "ADD": {
+      "TITLE": "Create a campaign",
+      "DESC": "Proactive messages allow the customer to send outbound messages to their contacts which would trigger more conversations.",
+      "CANCEL_BUTTON_TEXT": "Cancel",
+      "CREATE_BUTTON_TEXT": "Create",
+      "FORM": {
+        "TITLE": {
+          "LABEL": "Title",
+          "PLACEHOLDER": "Please enter the title of campaign",
+          "ERROR": "Title is required"
+        },
+        "MESSAGE": {
+          "LABEL": "Message",
+          "PLACEHOLDER": "Please enter the message of campaign",
+          "ERROR": "Message is required"
+        },
+        "SENT_BY": {
+          "LABEL": "Sent by",
+          "PLACEHOLDER": "Please select the the content of campaign",
+          "ERROR": "Sender is required"
+        },
+        "END_POINT": {
+          "LABEL": "URL",
+          "PLACEHOLDER": "Please enter the URL",
+          "ERROR": "Please enter a valid URL"
+        },
+        "TIME_ON_PAGE": {
+          "LABEL": "Time on page(Seconds)",
+          "PLACEHOLDER": "Please enter the time",
+          "ERROR": "Time on page is required"
+        },
+        "ENABLED": "Enable campaign",
+        "SUBMIT": "Add Campaign"
+      },
+      "API": {
+        "SUCCESS_MESSAGE": "Campaign created successfully",
+        "ERROR_MESSAGE": "There was an error. Please try again."
+      }
     }
   }
 }