Merge remote-tracking branch 'origin/master' into 4.1

backport kzd_freeswitch accessors (2600hz#3909)

* backport kzd_freeswitch accessors

* kz_term

Merge remote-tracking branch 'origin/master' into 4.1

Merge remote-tracking branch 'origin/master' into 4.1

HELP-30632_4oh: fix state picking on number creation (2600hz#3886)

* HELP-30632_4oh: really properly pick state for number creation

* HELP-30632: upgrade carriers info code

* HELP-30632: update tests

* HELP-30632_4oh: fix compile issue

* HELP-30632: moar test fixing

* HELP-30632: restrict states a bit better

Merge remote-tracking branch 'origin/master' into 4.1

Language docs 4 0 (2600hz#3861)

* get language with Default

* use account language/system language as default if config is missing

* add examples of setting up account prompts/language

* remove default language from schema

* fix xref issues

* one more time

Merge remote-tracking branch 'origin/master' into 4.1

Merge remote-tracking branch 'origin/master' into 4.1

HELP-30712: added maintenance remove_empty_media_docs/0 to clean syst… (

2600hz#3840)

* HELP-30712: added maintenance remove_empty_media_docs/0 to clean system_media

* HELP-30712: ignore design views