Remove 'use strict' from *.js files since ES6 modules are always in strict mode

frontend/app/activity/activity.services.js

frontend/app/admin/databases/databases.controllers.js

frontend/app/admin/databases/databases.module.js

...end/app/admin/metadata/components/MetadataEditor.react.js

...tend/app/admin/metadata/components/MetadataField.react.js

...end/app/admin/metadata/components/MetadataHeader.react.js

...end/app/admin/metadata/components/MetadataSchema.react.js

...tend/app/admin/metadata/components/MetadataTable.react.js

.../app/admin/metadata/components/MetadataTableList.react.js

frontend/app/admin/metadata/metadata.controllers.js

frontend/app/admin/metadata/metadata.module.js

frontend/app/admin/people/actions.js

frontend/app/admin/people/components/AdminPeople.react.js

frontend/app/admin/people/components/EditUserForm.react.js

...nd/app/admin/people/components/UserActionsSelect.react.js

frontend/app/admin/people/components/UserRoleSelect.react.js

frontend/app/admin/people/containers/AdminPeopleApp.react.js

frontend/app/admin/people/people.controllers.js

frontend/app/admin/people/people.module.js

frontend/app/admin/people/reducers.js