Figure out how to translate toilet issues.

Two things:
* We should use ``issue.value`` as the choice value rather than ``index`` (this gives us something nicer to pass on to Snappy).
* We should perhaps have a fallback for when there is no translations for the current language (maybe ``issue.value`` is an okay fallback for now).

I wonder if we need a fallback for when there is no translation for the current language? Maybe issue.value?