Fix Unsupported locale in wikipedia plugin

[rkaplers]

Should resolve #132 Problem is where locale getting passed is en-US, fr-FR, while we are checking for ALLOWED_LOCALES: const ALLOWED_LOCALES = [ 'en', 'ja', 'fr', 'de', 'es', 'ru', 'pt', 'zh', 'it', 'ar', 'pl', 'uk', ];

So the option is to split "-" and take first part of the locale that matches the allowed list.

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