Missing ids for checkboxes on user registration form

[kaitlinnewson]

Describe the bug
The two consent check boxes on the user registration form are missing id attributes, which should be the same as the existing name attributes and the associated label. This means the labels are not properly associated with the inputs, and is an accessibility issue.

This issue is present in the 3.3, 3.4, and main branches.

Additional context

healthSciences/templates/frontend/components/registrationForm.tpl

Line 122 in e5255ba

<input type="checkbox" class="form-check-input" name="privacyConsent" value="1"{if $privacyConsent} checked="checked"{/if}>

healthSciences/templates/frontend/components/registrationForm.tpl

Line 133 in e5255ba

<input type="checkbox" class="form-check-input" name="emailConsent" value="1"{if $emailConsent} checked="checked"{/if}>

[kaitlinnewson]

PRs for review:

• main: pkp/healthSciences#249 input labels on registration form #250
• 3.4: pkp/healthSciences#249 input labels on registration form #251

Not applicable for 3.3 (checkboxes are wrapped inside the label element).

[asmecher]

Both PRs merged, thanks!