Register custom Ethiopia date-picker as-per the new style

[samuelmale]

@sinteacon this draft has not seen light of any editor, it's just a demo of how this should be done in the simplified way. Please test it out locally and update the repo accordingly

[sinteacon]

@samuelmale currently master is not the latest branch but I have committed all the changes to dev branch and fixed another issue also. thanks for your support