Initial import of Template:B2GOnlyHeader2
Initial import of Template:B2GOnlyHeader2

https://developer.mozilla.org/en-US/docs/Template:B2GOnlyHeader2

Contributors (by MDN username):
* chrisdavidmills
* ethertank
* FredB
* hamasaki
* Jeremie
* teoli

jpmedley/kumascript,a2sheppy/kumascript,a2sheppy/kumascript,jpmedley/kumascript