Fix #1, Fix #2

gettext_pl requires the plugin name as the second parameter

Also, text with interspersed PHP code is not translatable. Instead use
sprintf to insert the variable information.
An "enable" separate from the plugin enable is redundant

Also, "empty($apikey)" will test for both '' and NULL with one test.
(also for the number zero, so you do need to be careful.)
Merge pull request #4 from sbillard/plugin-enable-is-enough

Plugin enable is enough