[🔥AUDIT🔥] Wrap string in i18n function (#839)

🖍 _This is an audit!_ 🖍

## Summary:
Somehow missed this when adding this file before.

Issue: XXX-XXXX

## Test plan:
String appears in CrowdIn

Author: nedredmond

Auditors: jeremywiebe, nixterrimus

Required Reviewers:

Approved By: jeremywiebe

Checks: ✅ codecov/project, ❌ codecov/patch, ✅ Upload Coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Cypress (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: #839

.changeset/heavy-books-yell.md

@@ -0,0 +1,5 @@
+---
+"@khanacademy/perseus": patch
+---
+
+Wrap string in internationalization function

packages/perseus/src/widgets/label-image/strings.ts

@@ -1,3 +1,5 @@
+import * as i18n from "@khanacademy/wonder-blocks-i18n";
+
 export const strings = {
-    hideAnswersToggleLabel: "Hide answer choices",
+    hideAnswersToggleLabel: i18n._("Hide answer choices"),
 };