Add i18next submodule to repo
Adjust Gruntfile and add dep and license information
Add global variables to jshint exception file
Initial i18n library and set fallback language to en
Replace internal translation with i18next
Remove old translation from jsxc
Add locale files

* german
* english
* spanish
Add qunit locale tests
Merge pull request #43 from Zauberstuhl/support_i18next

Support i18next and replace old translation