* Changes config_flow to allow dynamic length list of underlying entities
Updates previously defined 4x entries to new config style
Changes to thermostat_X to load underlying entities from list
Changes to thermostat X to display underlying entities as a list - COULD BREAK EXISTING TEMPLATES
* Modifies tests to use the new list format
* Added English translation for UI
* Removed all references to individual entities in strings/en.json
* Fix merge mistake
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Co-authored-by: Jean-Marc Collin <jm.collin.78@gmail.com>
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