allow dumping the error result to a json file

[phoet]

in order to post-process the result of the check, it would be great if one could dump it into some structured data. i picked json for no particular reason.

ideally, the output would also include things such as:

• where the information was obtained
• already existing translations for that key

the idea behind this is that i could hook up a translation service and suggest translations within a failed build, or even automate the first translation based on a given locale.

[aderyabin]

I like the idea. But I need to think about output format. Probably html, json, xml.