add title text to online status icon

The way it is now, with the online language image, seems hardcodded and messy, with two files inside a directory.
Its also still difficult to redesign an image for each style, when all the other buttons can be easily changed via css. We should change it to simple text and css.

Discussion: http://area51.phpbb.com/phpBB/viewtopic.php?f=81&t=48596
Example code for PR in the discussion.