Un-xfail test_settings_change_language as it looks like it was fixed via https://github.com/mozilla/gaia-ui-tests/commit/a8cb1820cefc62acf943c1dfd7ebb3850d3bf539
Merge pull request #680 from bobsilverberg/unxfail_lang

Un-xfail test_settings_change_language as it looks like it was fixed via...