Translator: enable in-page language switching

[rachelmcr]

It would be really helpful if translators and developers had a persistent switch they could use to allow them to change languages on any page (versus having to go back to /me to do it). The i18n code was already written with this type of feature in mind. This could be done as a bookmarklet or maybe a browser extension, but it would be great to have this as part of the community-translator widget. That would mean it would need to be persistent though, rather than only appearing when in a non-english language (although obviously still limited to people who have enabled it).

This would be helpful for translators to spot check different pages, and also for developers to find translation bugs. For example, we found a bug from a mistranslated string in Spanish, but it was more difficult than necessary to determine it was the actual translation at issue versus the translate() request. If we had a persistent language-switcher, that would be a lot easier.

If we don't want to make that translator toggle persistent, we could at least bring it up based on some keyboard command (still limited to people who have enabled it). Konami code anyone?

/cc @deBhal

[stale]

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