change language of comment-form-comment-subscribe

Hello, i need to change “Notify me via e-mail if anyone answers my comment.” into russian language, so i opened /wp-content/plugins/comment-reply-email-notification/cren_plugin.php then changed “Notify me via e-mail if anyone answers my comment.” into russian language but this label was still same, no changes =( how can i change that label ? Thank you in advance.

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