changes generation script to make intl data ucfirst

plugins/Intl/Commands/GenerateIntl.php

plugins/Intl/lang/be.json

plugins/Intl/lang/bg.json

plugins/Intl/lang/bs.json

plugins/Intl/lang/ca.json

plugins/Intl/lang/cs.json

plugins/Intl/lang/cy.json

plugins/Intl/lang/da.json

plugins/Intl/lang/de.json

plugins/Intl/lang/el.json

plugins/Intl/lang/en.json

plugins/Intl/lang/es.json

plugins/Intl/lang/et.json

plugins/Intl/lang/eu.json

plugins/Intl/lang/fi.json

plugins/Intl/lang/fr.json

plugins/Intl/lang/gl.json

plugins/Intl/lang/hr.json

plugins/Intl/lang/hu.json

plugins/Intl/lang/id.json