Add comment()-function for use in JS (automatically i18n'ed)

git-svn-id: https://svn.code.sf.net/p/rkward/code@4990 7936002b-cd1d-0410-9ce3-d7ebf93b5162
Start documenting plugin i18n

git-svn-id: https://svn.code.sf.net/p/rkward/code@4991 7936002b-cd1d-0410-9ce3-d7ebf93b5162
Fix validity error

git-svn-id: https://svn.code.sf.net/p/rkward/code@4992 7936002b-cd1d-0410-9ce3-d7ebf93b5162