Bug 976544 - Intermittent | browser_get_user_media.js | Unexpected Exception: TypeError: PopupNotifications.panel.firstChild is null - fourth attempt, r=Gijs.

--HG--
rename : browser/base/content/test/general/browser_get_user_media.js => browser/base/content/test/general/browser_devices_get_user_media.js
Bug 971047 - Import the CLD language detection library, r=felipe,azakai,gps.