Accessibility: Some form elements missing labels

[bedmison]

Form elements need labels so screen readers can properly announce the associated form field. For example, this shows up in the listings of exercises

Shows up in the CodeMirror interface.

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From the WCAG 2.1 spec:

To solve this problem, you need to fix at least (1) of the following:

• Element does not have an implicit (wrapped)
• Element does not have an explicit
• aria-label attribute does not exist or is empty
• aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
• Element has no title attribute
• Element has no placeholder attribute
• Element's default semantics were not overridden with role="none" or role="presentation"

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Solution? : Update code mirror and retest.