Thanks to charvel, the web app now has language localization support. Charvel used PHP gettext which should be familiar with those able to assist with translations. The framework is completely integrated and supported thanks to his work. Charvel also added translations for most common languages however only login information is translated at this point.
Another interesting thing, date strings are exported to be localized. If editing the PO files (using Poedit, etc), be sure to reference the PHP date string format before editing this however this will allow dates to be shown in the local format.
https://github.com/salbahra/OpenSprinkler-Controller/commit/3b03742f6b0446d9f96642b24c3d90895bd5f191