Enhance Breadcrumbs (#39)

* chore(localization): remove duplicated locale files

* feat(localization): add localization for breadcrumbs

* feat(localization): add beadcrumb enhancements

* feat(debugging): add npm run debug command

* chore(localization): add unit tests

* chore(breadcrumbs): fix tests and typos

* chore(localization): add docs for translationAvailable

* chore(localization): refactor translationAvailable

i18n/i18n.js

@@ -44,3 +44,14 @@ module.exports.translate = (symbol, locale = 'en-US') => {
 
   return translatedValue
 }
+
+/**
+ * Checks if string is translatable
+ * @param symbol string Identifier for static text
+ * @param locale string Locale code
+ *
+ * @returns boolean
+ */
+module.exports.translationAvaliable = (symbol, locale = 'en-US') => {
+  return !!(translations[locale] || {})[symbol]
+}

i18n/locales/en-US.json

@@ -15,6 +15,7 @@
   "logoAlt": "Contentful Example App",
   "homeLabel": "Home",
   "coursesLabel": "Courses",
+  "lessonsLabel": "Lessons",
   "footerDisclaimer": "Powered by Contentful. This website and the materials found on it are for demo purposes. You can use this to preview the content created on your Contentful account.",
   "imprintLabel": "Imprint",
   "contactUsLabel": "Contact us",