basic-cfg: asterisk.conf: don't set languages

basic-cfg: asterisk.conf: don't set languages

* No need to set language in a miniml configuration. 'en' will do just
  fine.
* It would be useful to have an example of setting it to a different
  language.
* Setting the documentation language explicitly is likewise not
  required. Setting it to a different value is not common. At least
  until there is a set of translated documentation.

Change-Id: I94d91ea34e129925f25af81ef8dc0906fb568cb7
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>