SVG upload with specific error (warning) message when blocking

SVG upload with specific error (warning) message when blocking

This patch is to generate specific error (warning) message when
blocking an svg file.

The checkSvgScriptCallback function has been updated, and it's
return type is changed from boolean to array.

A new variable is added to XmlTypeCheck class that contains the
type of error when svg file is uploaded, which is used to generate
concrete error messages later on.

I have added concrete error messages to i18n/en.json and their description
to qqq.json file. Please review the error messages and their description.

Bug: T85924
Change-Id: I3f687bf5b86ce66b703591b85fd03f073aacff4f