Accessibility enhancements: Combine 2 separated links for attachment icon and text

1. Create a course with student and teacher enrolled. 2. Create a new workshop. 3. As a student, submit his/her work with attachment(s). 4. As a student, in Assessment phase/Closed phase, check if the attachment(s) meet the requirement. 5. As a teacher, in Assessment phase/Grading evaluation phase/Closed phase, check if the attachment(s) meet the requirement.