No, God, no, Akeeba Backup IS NOT the source of your problems. The problem of the untranslated string is that Joomla! fails to load its library translation file under some circumstances. This is a bug which is already fixed in Joomla! 3.4 as far as I know. The conditions leading to this Joomla! bug are unlikely to occur when you're doing a direct installation, likely to occur on upgrades and very likely to occur when using the System Restore Points feature of Akeeba Backup. We have even included a workaround for that issue in our code... Everything you read on the web pointing to us is, simply put, wrong. Correlation does not equal causation. Akeeba Backup IS NOT preventing the installation of your updates, it simply uncovers a translation bug in Joomla!. The real problem lies with your hosting environment.
Regarding the real nature of this issue: your site cannot contact the extension's update site. You can disable the System - System Restore Points plugin and retry the update to get the exact error message. As I said, the error message is unrelated to Akeeba Backup. Once you get the complete, exact error message please file a ticket with SiteGround for further troubleshooting instructions.
Also, FYI, System Restore Points is scheduled to be removed in Akeeba Backup 4.2.0.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!