TEIIDDES-746 Translator/JNDI Name cells should be a comboboxes, but not textboxes. CellEditors for the translator and JNDI name columns are now comboboxes when a default server is connected. The comboboxes are filled with the existing translator names and data source names obtained from the Teiid Server. The user is still allowed to add their own name if they don't want to choose and existing one. If there is no default server or the default server is not connected the CellEditor remains a text field. Also those columns are now readonly if VDB is readonly.