[Enhancement] Format messages in widget (#268)

* Use message formatter in widget

* Rename the variable

app/javascript/shared/mixins/messageFormatterMixin.js

@@ -0,0 +1,10 @@
+import MessageFormatter from '../helpers/MessageFormatter';
+
+export default {
+  methods: {
+    formatMessage(message) {
+      const messageFormatter = new MessageFormatter(message);
+      return messageFormatter.formattedMessage;
+    },
+  },
+};