Ninja Forms - Date Picker Translation Not Working

Overview of the issue

When translating the Ninja Forms date picker, the translations from String Translation are not applied. This issue arises due to changes in the core WordPress load_plugin_textdomain function.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open the …/wp-content/plugins/ninja-forms/ninja-forms.php file.
• Look for line 779.
• Replace:

          unload_textdomain('ninja-forms');
          

• With:

          unload_textdomain('ninja-forms', true);