* refactor: update date injection functionality in agents
- Changed the description of the parameter to clarify that it injects the current date into the agent's prompt instead of tasks.
- Removed the method as it was no longer needed.
- Implemented a new method in the class to handle date injection directly into the prompt.
- Updated tests to ensure the date is correctly injected into the system prompt and user messages based on the flag.
* translations
* nit