Days field needs to have strict restrictions, at the moment can add minus "-" and 5 decimals

Steps to reproduce:

1. Create a new Holiday Request
2. Select a Start and End Date
3. In the Days field remove the default 1.0 and add a negative number, with many decimals e.g. "-1.26236"
4. Add a manager
5. Click Save this request and send a notification to the manager

Expected results: You are not allowed to add/save negative values, you are only allowed to add 2 decimals.

Actual results: You are allowed to add/save negative values and 5 decimals.