Correcting the language span tool so the ve.ui.LanguageInspector has
static name changed from 'language' to 'meta/language'
Change-Id: I66fd3d2558663c9f1304365a11fd1276e204a7e7
Objectives:
* Got rid of mw prefixing in tools, inspectors and dialogs
* Simplify tool classes so they can be generically used as items in bars, lists and menus
* Add support for a catch-all toolbar group
* Simplify tool registration, leaning on tool classes' static name property
* Move default commands to command registry
* Move default triggers to trigger registry
* Get language tool working in standalone
Change-Id: Ic97a636f9a193374728629931b6702bee1b3416a