[WIP] Mode Translations

**NOTE:** In it's current state, this is not even close to being ready to pull yet, but this can serve as space for code-specific discussion and more commits from me (coming real soon)! General discussion and updates should probably be in #186, and code specific conversation can be here. 

The start of my work to get mode translation working, I changed the
print mode to actually have the respective translate text in a translate
file instead of in the code directly. List of changes:
- Static translate strings embedded in the HTML have been changed to
translate strings
- Dynamic translate strings (status messages) are translated and added
to an array at the beginning of the mode JS file. This array is
referenced instead of a translate string (keeping all major translate
strings in the same place)
- Added all strings to the existing print i18n mode file.

TODOs:
- Actually write the backend code to translate the strings in mode.
- Create base English translations from existing text in other modes.
- Create mode translations for other languages we support.
Text like this might be generic enough to live in the common section of the main i18n file, which could save some duplication. Modes should be able to lean on the main application, but not the other way around (with the exception of the core modes, of course ;)