Add support for alt text for legend images#7

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pmacMaps wants to merge 4 commits intow8r:masterfrom pmacMaps:accessibility-images

+13,158-17

Commits on Apr 6, 2019

add alt attribute to legend creation
pmacMaps
committed

Commits on May 29, 2019

Update layer template for alt text property so that it references the 'label'.
pmacMaps
committed
Update alt text code section from 'layerName' to 'label'
pmacMaps
committed

Commits on May 31, 2019

Remove English language text in alt attribute for image.
pmacMaps
committed