Internationalize third party services

[wbazant]

The 3rd party services should be internationalized as well as the locale:

• Google Maps (compare the map e.g. to https://fallingfruit.org/?locale=ar)
• Google Street View
• Recaptcha
• Date picker (review form)

Reported in #699 (review)

[wbazant]

Google services come with a major bummer - you can't change the language once the API has loaded. There are tricks to unload + load the script, or we can refresh the page, but I think it's useful to offer easy changes of language for e.g. comparing common names, see #705. The proposed resolution is to toast.info that the language changed, and the user can refresh page to reload map.

[wbazant]

Also, the date picker comes from the browser, you can't change language there.

AI suggested

<div lang="fr">
  <input type="date" {...props} />
</div>

but it doesn't work for me in Ubuntu/Firefox.