XWikiMessageTool does not support non-latin1 characters in the resource documents

The tool should preserve non-latin1 characters, to ease the bundle creation. This should be achieved for xwiki-document bundles, as they support non-ascii characters, and it would be bad to ask the users to write \u0193 for a single character. However, the tool should not change the behavior for filesystem bundles, as it will mean ignoring the java specification.

For filesystem resource bundles, you can still use unicode escapes or xml char references.