Multilingual CiviCRM 2.2 sites fail to upgrade to 2.2.7

2.2.7 introduces a new table, civicrm_report_instance, with a localisable description column. Unfortunately, in multilingual sites this column is not created properly (instead of separate civicrm_report_instance.description_xx_YY columns, a single civicrm_report_instance.description column is created). This makes the 2.2.6 → 2.2.7 upgrade fail for multilingual sites.

The fix for 2.2.8+ should be as simple as possible: do not treat civicrm_report_instance.description as localisable. Upgrade to 3.0.alpha1 should, in turn, multilingualise this column.