Fixed #157: Made 'type' command using default LANG (not system LANG) to ...

Made 'type' command using default LANG (not system LANG) to check if function or alias.

Calling 'type -a' delivers localized text which then is used for grep, e.g. "...  is a function"

Two changes are provided:

1) Use paramter t which just delivers "function", "alias", etc. which makes it more clear what to grep for. See http://linuxcommand.org/lc3_man_pages/typeh.html
2) Use type's default language by setting LANG=C, just in case someone maintaining 'type' will also localize return values "function", "alias", etc. 
Shouldn't this be `grep 'function'` here?