Replace substr with mb_substr in PINT theme

[Anonymous]

I encountered an error [“Database error see the log files (log files path can be found on Newsletter diagnostic panel)”] when creating a new newsletter using PINT theme, with following being written into the log:
13-09-2017 08:09:48 – FATAL – m: 21,1 MB, u: 1 –
13-09-2017 08:09:48 – FATAL – m: 21,1 MB, u: 1 – SHOW FULL COLUMNS FROM wp_newsletter_emails

After some debugging, I found out the problem. My article titles contain diacritical characters and because the theme is using substr to trim the titles, some invalid characters appear occasionally and $wpdb->insert fails consequently. The solution is to use mb_substr (multi-byte safe substr) in theme.php instead of substr.

[Author]

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