Unable to call LanguageSuggestionController function due to wrong service name [#3487118]

Problem

The latest version has issue when the frontend is calling "/language-suggestion/get-county-code"

The errorshows

The website encountered an unexpected error. Try again later.

InvalidArgumentException: The controller for URI "/en/language-suggestion/get-county-code" is not callable. in Drupal\Core\Controller\ControllerResolver->getControllerFromDefinition() (line 53 of core/lib/Drupal/Core/Controller/ControllerResolver.php).

Steps to reproduce

Install the latest 8.x-1.x
Enable module
Try open '/en/language-suggestion/get-county-code'

Proposed resolution

The service registered in language_suggestion.services.yml doesn't matches the service name retrieved in LanguageSuggestionController.php line 37

Fix the language_suggestion.services.yml file to resolve the issue

Issue fork language_suggestion-3487118

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3487118-unable-to-call changes, plain diff MR !8
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