XML import of many definition terms.
Internationalization & fixes.
Merge branch 'master' of https://github.com/bedita/glossary into glossary-import

Conflicts:
	controllers/glossary_controller.php
Added DTD validation.
Revert "Added DTD validation."

This reverts commit 1a973580dcfa43b7143ddfcff8b7b143fcccb4a5.
Categories' handling updated, as of BEdita issue #555.
Coding style fixes.
#2 Added DTD declaration and XML example.
#2 Added option to force or avoid nickname duplicates. Fixed Transaction behavior.
#2 Coding style fixes.
Merge branch 'glossary-import'

Conflicts:
	controllers/glossary_controller.php