1 files changed, 14 insertions, 3 deletions
diff --git a/ui/i18n.js b/ui/i18n.js
index 0f4e9fce4..db79c87e8 100644
--- a/ui/i18n.js
+++ b/ui/i18n.js
@@ -11,9 +11,20 @@ if ((chrome && chrome.i18n && chrome.i18n.getMessage) ||
 } else {
   // fallback function
   console.warn('browser.i18n API not available?')
-  let msg = require('../app/_locales/en/messages.json')
-  getMessage = function (key) {
-    return msg[key].message
+  const msg = require('../app/_locales/en/messages.json')
+  getMessage = function (key, substitutions) {
+    if (!msg[key]) {
+      console.error(key)
+      throw new Error(key)
+    }
+    let phrase = msg[key].message
+    if (substitutions && substitutions.length) {
+      phrase = phrase.replace(/\$1/g, substitutions[0])
+      if (substitutions.length > 1) {
+        phrase = phrase.replace(/\$2/g, substitutions[1])
+      }
+    }
+    return phrase
   }
 }