Comment 2 for bug 1796936

I created a branch for this called user/sandbergja/lp1796936_label_grid_checkboxes

Here's a link: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sandbergja/lp1796936_label_grid_checkboxes

I decided to keep it simple (especially since Angular doesn't allow ICU messages in attributes: https://github.com/angular/angular/issues/21615). Each row's checkbox has an aria-label like "Row 12". The header row's checkbox has an aria-label like "All rows". Saying select or unselect should be redundant, since it is a checkbox.

Let me know what you think!