Version 1.3.1 + xpi
Add basic multilingual support.
Change `&` -> `&amp;` to make the add-on description work for locale nl-NL.
Add shell script to patch generated XPI files created by `cfx xpi`. These files do not copy the localized descriptions from install.rdf
Update version to 1.4.0 (support for languages EN and NL).
Update supported browser version to 30.