Upgrade preact-i18n to 2.3.1-preactx

[rob-mccann]

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Description of change

preact-i18n uses the new Context API and has removed support for the legacy API.

I've added a sort of shim in for now into these functions to allow us to rewrite them to use the new API one by one.

Allows #1128 to be re-added.

Closes #1132

[codecov]

Codecov Report

Merging #1133 (1eb3079) into master (1d58b39) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1133   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files         639      639           
  Lines        8097     8097           
=======================================
  Hits         7795     7795           
  Misses        302      302           

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[atrovato]

That's a good point!!!
All 'context' usages look changed.
I need to test it locally new.

[atrovato]

Works fine locally.

[Pierre-Gilles]

Looks good to me! I tested on most screens. Couldn't test some integrations (Zigbee2mqtt), l'll merge this on master, build a docker dev tag and ask the community to make sure everything is working properly.

Thank you for your contribution! 👏