Editable aria-label for search field (and other fields)

[El-Rico]

I'd like to add an ariaLabel option to searchui.searchField({}) to change the default aria-label for Accessibility purposes.

[haoAddsearch]

@El-Rico you can customise searchField's rendered HTML by using the option "template". Could use this default template with some minor tweaks: https://github.com/AddSearch/search-ui/blob/master/src/components/searchfield/precompile-templates/searchfield.handlebars