Each message / label used within the plugin can be easily translated either directly in shortcode or on Wise Chat Settings page. No need to wait for translation to your language. You can do it yourself in a moment.
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Shortcode:
[wise-chat channel="localization" theme="lightgray" show_user_name="1" allow_post_links="1" allow_post_images="1" enable_images_uploader="1" enable_twitter_hashtags="1" show_message_submit_button="1" allow_change_user_name="1" emoticons_enabled="1" window_title="Light Gray Theme" enable_youtube="1" allow_change_text_color="1"]