Increase the number of updates per cron.

The Localization Update Cron job checks for available translations and updates translations if required. Whether or not cron does this and how often is configurable. The maximum number of projects which are checked and which are updated are currently set to 1 per cron. On an average site of 50 modules, one language with updates configured at once per day. The site takes 50 days to check all translations.

This patches changes the settings (in code) to check max 10 projects per cron and update max 2 translations.

Patch is committed to 6.x and 7.x branch. This issue is to documents the change.