Fixed the constructor for PlainStructureComparator
Added language setting with getter/setter

currently only used for firefox
added language setting support to firefox profile
Support multi language in browsers

Builds upon https://github.com/crawljax/crawljax/pull/284
Merge pull request #285 from crawljax/feature/browser-multi-language

Support multi language in Browsers
Merge pull request #283 from crawljax/fixes/plain-structure-comparator-contructor

Fixed the constructor for PlainStructureComparator