Implement plugin check action

[jdevalk]

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[jdevalk]

Please give the translations a good test too, as I removed the load_plugin_textdomain call.

[ilicfilip]

For me translations are not working with or without the load_plugin_textdomain call.

Reason is that text domain is defined as comment-hacks, but that doesn't match the plugin slug which is yoast-comment-hacks. So the translations are downloaded from .org repo, but because of the mismatch they are not used. When I change search & replace text domain in the PHP files they are loaded fine.