Issues #1177412 and #1152726 re language support (now customizable through the administrative interface).

Issue #1177250 by dizarter, relocating "show on teasers" and "content type" checks closer to "case" statement. Also condensed the "likebutton" variable.

Added option to include button on teasers.
Added notations to code.
Updated hook_uninstall().

Also removed duplicate form from admin file

MANY configuration options added, block added, updated fetched Facebook URL to https so button can be displayed on secure sites, additional perms added.