Use the parse date, not the current date as POT creation date

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Ideally we'd use the release date itself, but that is not available (yet) to the module. However, thinking more about this, the project last parse date is still not the most accurate date we have, since a project might have numerous releases parsed, and the project last parsed date is the last of these. So when you export a template for an older release, the date would not be right. So I'd say we should use the release last parsed date when a release is set. Something like:

$export_date = date("Y-m-d H:iO", isset($release) ? $release->last_parsed : $project->last_parsed);

We do have a file_date column in the release table, which can be useful to count this. It might be more accurate compared to the parse date.

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