RFP: Replace Handlebars with vanilla HTML and a localization JS library

[clhenrick]

The benefits of ditching the HandlebarsJS based translation implementation and instead using vanilla HTML with a localization JS library such as i18next would be:

1. The page would at least still load if JavaScript was disabled by the user
2. A localization library could also help with supporting other important features relating to localization such as date/time formatting
3. Would possibly make the HTML markup a bit easier to maintain?

Could probably keep/utilize the current implementation of the locales JSON files in app/public/locales