Translatable strings, toolbarload fix, proper css enqueue & options page fixes.

Made text strings translatable & created lang directory for textdomain 'atbar'
Case correction on some strings (from Atbar to ATbar)
Fixed toolbar loading action (from get_footer to wp_footer).
Fixed checked/unchecked of 'exclude' boxes on options page.
Properly enqueued CSS file using wp_enqueue_style & added appropriate action.