feat: Adds email signature form to profile settings (#3906)

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

@@ -19,6 +19,18 @@
         "TITLE": "Profile",
         "NOTE": "Your email address is your identity and is used to log in."
       },
+      "MESSAGE_SIGNATURE_SECTION": {
+        "TITLE": "Personal message signature",
+        "NOTE": "Create a personal message signature that would be added to all the messages you send from the platform. Use the rich content editor to create a highly personalised signature.",
+        "BTN_TEXT": "Save message signature",
+        "API_ERROR":"Couldn't save signature! Try again",
+        "API_SUCCESS": "Signature saved successfully"
+      },
+      "MESSAGE_SIGNATURE": {
+        "LABEL": "Message Signature",
+        "ERROR": "Message Signature cannot be empty",
+        "PLACEHOLDER": "Insert your personal message signature here."
+      },
       "PASSWORD_SECTION": {
         "TITLE": "Password",
         "NOTE": "Updating your password would reset your logins in multiple devices.",