Add about.md and csf-transition-guide.md translations

[bethanyaconnor]

No description provided.

[Hamms]

Hmm, looks like the new files got downloaded as about.md.es-MX.partial instead of as about.es-MX.md.partial as I would have expected. Have you been able to verify whether or not that actually works?

[bethanyaconnor]

You're right, the international/about pages don't work (they just render in English). The translations render if I change the suffix to <locale>.md.partial though.

[Hamms]

Yeah, that's what I figured. Go ahead and change the files in this PR; I'll update

code-dot-org/bin/i18n/codeorg_markdown_crowdin.yml

Line 12 in 268ea5e

"translation": "/i18n/%original_path%/%file_name%.%locale%.%file_extension%",

to produce the right naming scheme for the next sync