Hi Hans,
1. When WordPress check for the new plugins, it will check for BuddyDev for any new updates available.
2. If an update is available, you can see the change log by clicking view details.
3. If you plan to upgrade it automatically, you can click on upgrade now link and It will be automatically upgrade.

The process and behavior is same as normal WordPress upgrade routine. No forced update. By automatic upgrade I meant to say that you can just click and upgrade from the admin dashboard(like you do for other WordPress plugins).

PS: If it is not privacy related and you don’t mind, I will love to bundle your languages file in the plugin if you allow.