Contact Form 7 - "Placeholders" attributes are not translatable via Translate Everything mode

Overview of the issue

The Contact Form 7 plugin allows you to set placeholders in your forms. However, if you are using WPML’s Translate Everything feature, you will find that they are not translated automatically.

This is a known limitation from our Advanced Translation Editor as explained in our documentation. You need to manually select your form placeholders and send them for translation.

Workaround

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

• Open wp-content/plugins/contact-form-7-multilingual/classes/Placeholders.php file.
• Look for line 40.
• Replace:

  			// $addEqualSignOnPlaceholder :: string -> string
  			$addEqualSignOnPlaceholder = Str::replace( 'placeholder "', 'placeholder="' );
  

• With:

  			// $addEqualSignOnPlaceholder :: string -> string
  			$addEqualSignOnPlaceholder = Str::replace( 'placeholder "', 'placeholder "' );