Added translation file notice

:) Some notice :octocat: will be happy for translation notice... hehe
This is universal truth for loading WordPress plugins translation files and in my opinion adding `WordPress Plugin Translations Supports: WP_LANG_DIR . "/plugins/{$textdomain}-{$locale}.mo";` will not be the best idea. Already there is avoid message for overwriting with custom translations. Have a review @claudiosmweb and @mikejolley