Require PHP 7.2, switch to Playwright

[swissspidy]

• Require PHP 7.2
• Hide form if there are zero languages
  • Edge case that happens for example for a fresh new site that's offline and can't download the list of available translations.
• Switch to Playwright
• Set up wp-now for quick local testing without Docker

Fixes #861

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.90%. Comparing base (85fc73e) to head (5f60ebb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1047   +/-   ##
=======================================
  Coverage   93.90%   93.90%           
=======================================
  Files           5        5           
  Lines         640      640           
  Branches       39       39           
=======================================
  Hits          601      601           
  Misses         39       39           

Flag	Coverage Δ
default	91.55% <ø> (ø)
js	100.00% <ø> (ø)
multisite	91.55% <ø> (ø)

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