initial checkin of i18n plugins
overriding equals method in string verifier since it can give false positives if someone uses it instead of 'textEquals'
cherry picking some commits made by @james-s-turner in #324 since its needded for the i18n bundler
more functionality and another test for i18n bundler
yet more functionality and tests for i18n bundler
ordering asset files so language only locales can be overridden
splitting up plugin tests into seperate taghandler and content plugin tests