You can translate widgets titles with Pro version. To do so, please follow the steps below:
1. Go to "Dashboard" => "Appearance" => "Widgets".
2. Then select the necessary widget and maximize it.
3. After having set the title and content, find the "Add Title for” option, select the necessary language and click “Add” button.
4. Enter the widget title for the selected language in the field that appeared and click “Save” button.