i18n

[kgilles]

We need to support multiple different languages and enable contributors to submit translations.
The want is to add an i18n library to help us configure and structure our app to easily create and use translations.

For this task we only want to focus on configuration and support of the (American)English language. All other required languages will be added as a quick follow. "Quick" being relative.

Criteria

• Add an i18n library
• Create a configuration to support English
• Create an English locale file and add all hard-coded UI copies to it
• Replace all hard-coded text strings with the i18n approach