Folder restructure (#6304)

* Remove ui/app/keychains/

* Remove ui/app/img/ (unused images)

* Move conversion-util to helpers/utils/

* Move token-util to helpers/utils/

* Move /helpers/*.js inside /helpers/utils/

* Move util tests inside /helpers/utils/

* Renameand move confirm-transaction/util.js to helpers/utils/

* Move higher-order-components to helpers/higher-order-components/

* Move infura-conversion.json to helpers/constants/

* Move all utility functions to helpers/utils/

* Move pages directory to top-level

* Move all constants to helpers/constants/

* Move metametrics inside helpers/

* Move app and root inside pages/

* Move routes inside helpers/

* Re-organize ducks/

* Move reducers to ducks/

* Move selectors inside selectors/

* Move test out of test folder

* Move action, reducer, store inside store/

* Move ui components inside ui/

* Move UI components inside ui/

* Move connected components inside components/app/

* Move i18n-helper inside helpers/

* Fix unit tests

* Fix unit test

* Move pages components

* Rename routes component

* Move reducers to ducks/index

* Fix bad path in unit test

1 files changed, 44 insertions, 0 deletions

diff --git a/ui/app/helpers/utils/i18n-helper.js b/ui/app/helpers/utils/i18n-helper.js
new file mode 100644
index 000000000..db07049e1
--- /dev/null
+++ b/ui/app/helpers/utils/i18n-helper.js
@@ -0,0 +1,44 @@
+// cross-browser connection to extension i18n API
+const log = require('loglevel')
+
+/**
+ * Returns a localized message for the given key
+ * @param {object} locale The locale
+ * @param {string} key The message key
+ * @param {string[]} substitutions A list of message substitution replacements
+ * @return {null|string} The localized message
+ */
+const getMessage = (locale, key, substitutions) => {
+  if (!locale) {
+    return null
+  }
+  if (!locale[key]) {
+    log.warn(`Translator - Unable to find value for key "${key}"`)
+    return null
+  }
+  const entry = locale[key]
+  let phrase = entry.message
+  // perform substitutions
+  if (substitutions && substitutions.length) {
+    substitutions.forEach((substitution, index) => {
+      const regex = new RegExp(`\\$${index + 1}`, 'g')
+      phrase = phrase.replace(regex, substitution)
+    })
+  }
+  return phrase
+}
+
+async function fetchLocale (localeName) {
+  try {
+    const response = await fetch(`./_locales/${localeName}/messages.json`)
+    return await response.json()
+  } catch (error) {
+    log.error(`failed to fetch ${localeName} locale because of ${error}`)
+    return {}
+  }
+}
+
+module.exports = {
+  getMessage,
+  fetchLocale,
+}