Properly handle languages that can't be spellchecked
@mcatanzaro
Submitted by Michael Catanzaro Link to original bug (#743069)
Description
A lot of the languages we offer in the preferences dialog do not contain a locale (e.g. simply en rather than en_US). This works for the Accept-Language header, but it's no good for spell checking. We need to make this clear in the UI. It'd also be good to not tell WebKit to try spellchecking these languages.