Class OGVisao refactored to GraphicalView.
Class OGTabela refactored to TableView.
Class OGRelationamento refactored to RelationshipView. Pending comment
translation.
Some error message typos corrections.
Merge remote-tracking branch 'upstream/code-refactoring' into code-refactoring-trans-fr
Updated and translated with latest code commits (pulled from 76ae751a67)