Improve string handling in xsl back calls
Improvements to schema-conversions
Merge pull request #296 from geosolutions-it/2.10.x

Improve string handling in xsl back calls.
Improvements to schema-conversions.
Italian translation / Update GUI and ISO19139 labels (by DGuidi)
Fix for issue #318
Fix for #319
Schematron ruleset titles in schema-plugins. Close #325.