Validation report / Improve XSD error message

[fxp]

Currently, XSD error are displayed to end user as produced by the parser.

eg.

cvc-complex-type.2.4.a: Invalid content was found starting with 
element 'gmd:dateType'. One of 
'{"http://www.isotc211.org/2005/gmd":date}' is expected. (Element: 
gmd:dateType with parent element: gmd:CI_Date)

The idea is to transform those messages to a more user friendly message for common error messages in the editor:

• invalid data type (datatype-valid.1.2.1)
• invalid content (complex-type.2.4.a)
• missing element (complex-type.2.4.b)
• Type error (cvc-type.3.1.3)

The transformation consists of:

• add the name of the element (defined in labels.xml) instead of {"​http://www.isotc211.org/2005/gmd":date} or gmd:date information
• translating the message to the GUI language

The above exemple will result to the following message in French:

 Élément invalide. Contenu invalide pour l'élément : Type de date 
(gmd:dateType). Un des éléments suivants (gmd:date) est attendu. 
L'élément parent est Date (gmd:CI_Date). L'erreur XSD complète est :
 Invalid content was found starting with element 'gmd:dateType'. 
One of '{"http://www.isotc211.org/2005/gmd":date}' is expected. 
(Element: gmd:dateType with parent element: gmd:CI_Date) (complex-
type.2.4.a)

See screenshot.

[fxp]

r7242