Added eslint config; fixed some eslint errors in frontUi.js; case error in...

Edson Júniorrequested to merge
issue/views_bulk_operations-3316610:3316610-replace-the-readme.txt-to-md into 4.2.x

Added eslint config; fixed some eslint errors in frontUi.js; case error in funstional javascript tests fixed.

Closes #3316610

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