This contrib replaces the orders_comment.php file with one that adds an entry for a language entry when it does not exist.

Previously, it could only update existing languages comments.

Example:
Order comment 1 exists in dutch and english
You define a new language
You try to update Order comment 1 for the new language, that doesn't work.

This enhanced files inserts new comment entry when language entry is empty.

Improvements or comments are welcome.

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