chore: add missing problem text for localization

Author: Muhammad Faraz Maqsood

src/editors/containers/ProblemEditor/components/SelectTypeModal/content/Preview.jsx

@@ -21,7 +21,7 @@ const Preview = ({
   return (
     <Container style={{ width: '494px', height: '400px' }} className="bg-light-300 rounded p-4">
       <div className="small">
-        <FormattedMessage {...messages[`problemType.${problemType}.title`]} /> problem
+        <FormattedMessage {...messages[`problemType.${problemType}.title`]} /> {intl.formatMessage(messages.problemTextInPreviewTitle)}
       </div>
       <Image
         fluid

src/editors/containers/ProblemEditor/components/SelectTypeModal/content/messages.ts

@@ -139,6 +139,11 @@ const messages = defineMessages({
     }`,
     description: 'Message for support status tooltip',
   },
+  problemTextInPreviewTitle: {
+    id: 'authoring.problemEditor.preview.problemTextInPreviewTitle',
+    defaultMessage: 'problem',
+    description: 'Problem text in title for the problem preview column',
+  },
   previewTitle: {
     id: 'authoring.problemEditor.preview.title',
     defaultMessage: '{previewTitle} problem',