Need to rename the headers of attendance sheet.

[kolla47]

Summary:

The attendance sheet has headers as 1st years and 2nd years, it will be better if we rename them after the year of joining as 2017 batch and 2016 batch.

Steps to reproduce the issue:

link: https://amfoss.in/attendance/2018/7/22/

How can we reproduce the issue?

Expected behavior:

What did you expect the website to do?

Observed behavior:

What did you see instead? Describe your issue in detail here.

GIF/Screenshots:

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[rammanoj]

I guess this feature got implemented presently? I even found headers with 2017, 2016 in the link provided in the description.