multi-lang: add language to account schema
multi-lang: add default language to system_config

remove erroneous module
multi-lang: cleanup say command to use language of call, as well as some
other dialplan commands using language
multi-lang: commit of the dialplan changes
multi-lang: clarified some bits on using prompts
Merge pull request #418 from 2600hz/multi-lang

Multi lang - more language-based tweaks