Gutenpack: I18n for blocks

[tyxla]

We need to find a way to allow our Jetpack blocks for Gutenberg to be fully translatable.

One way we can get around it is to make i18n-calypso use the same jed version that Gutenberg core does, and then try to reuse the same translations in Jetpack, thus let Jetpack supply them.

For this to happen:

• We're updating jed - fix(deps): update dependency jed to v1.1.1 i18n-calypso#72 (comment)
• We're updating Calypso to use [email protected] (which bundles the updated Jed) - Framework: Use i18n-calypso v3.0 #27820
• We're updating the translation build scripts:
  • Initial attempt - D19319-code
  • Improved attempt - D19382-code
• We're updating the Jetpack blocks to use the Jetpack textdomain - Gutenberg: Add textdomain to Jetpack blocks #27680.
• We're making sure Jetpack serves the new version of translated files, and that they work well in both Jetpack and Gutenberg - i18n: Update i18n-calypso package to latest version. jetpack#10347
• We're making sure those translations are indexed by Jetpack when building translation files (see pa9srA-32-p2 , i18n extractor: extract strings from Gutenberg Blocks. jetpack#10391 and Gutenberg: Add i18n wrappers to provide the Jetpack textdomain #28088)
• We're making sure jed >= 1.1 translation files are deployed for all languages.
• We're finding a way for those translations to work not only in Jetpack, but in Calypso as well.

[tyxla]

A summary of the work so far with a brief vision for the future has been posted in pafL3P-6B-p2

[scruffian]

Closing, since the code lives in Jetpack this will happen a different way: Automattic/jetpack#11817