Changes 'Todo' to 'To Do' in ee

What does this MR do?

This MR changes "Todo" to "To Do" in the UI

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

Performance and testing

No performance or testing concerns

Security

No security concerns