Improve admin/system_info page ui

What does this MR do?

Improve admin/system_info page user interface. Also adds internationalization to text on the page.

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content