FIX: Add back i18n strings that were removed (#214)

Author: nattsw

config/locales/client.en.yml

@@ -6,6 +6,8 @@ en:
           discourse_translator: "Discourse Translator"
   js:
     translator:
+      view_translation: "View translation"
+      hide_translation: "Hide translation"
       content_not_translated: "Content not translated. Click to translate"
       content_translated: "Content is translated. Click to view original"
       translated_from: "Translated from %{language} by %{translator}"