Remove strongloop from footer

[bjohansebas]

The message it had gave the impression that IBM/StrongLoop is still handling the translations for those languages. If there are no objections from @expressjs/express-tc, we can merge this PR. Rand agrees to remove it if there are no objections.

Additionally, I added a section in the README to acknowledge and give proper credit.

Once this is merged, I can continue with #1768.

cc: @expressjs/express-tc @expressjs/docs-wg

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[bjohansebas]

Doing this is also important so that we can fully translate the website from Crowdin

[bjohansebas]

Blocked until https://github.com/expressjs/expressjs.com/pull/1777 is launched.

[wesleytodd]

Is this still a thing? #1777 is closed, but I am not clear how those are connected.

[bjohansebas]

I'm still fixing some errors in the translations, I can continue with the translations next week.

[ShubhamOulkar]

Blocked until https://github.com/expressjs/expressjs.com/pull/1874

[bjohansebas]

@expressjs/express-tc, @ctcpip, please take a look.