Interrapt G25

Admin user is able to register an attendee with entering numbers in the 'High school' field, even though by the specification the 'High school' field should accept alphabetic characters (both Latin and Cyrillic), special characters (only “- “,” `”, “.” and “& “) and spaces.

Steps to reproduce
1. Log in with valid credentials
2. Navigate to https://qainterrapt.brainster.xyz/attendees
3. Click on 'Create' button
4. Fill the 'High school' field with numbers
5. Click on 'Create' button.

Expected result
Message should be displayed: 'The High school must be a letters.' The admin user should not be able to register an attendee using numbers in the 'High school' field.

Actual result
An attendee is registered with numbers in the 'High school' field.

Browsers
Chrome on Windows 114.0.5735.198
Mozilla Firefox 117.0