As reported by Elena in MDL-14232:

The import groups feature (moved to Settings > Course administration > Users > Groups in 2.0) needs a help popup.

The string importgroups is currently in moodle.php. I suggest moving it to group.php.

Please could the following help and link strings be added:

$string['importgroups_help'] = 'Groups may be imported via text file. The format of the file should be as follows:

• Each line of the file contains one record
• Each record is a series of data separated by commas
• The first record contains a list of fieldnames defining the format of the rest of the file
• Required fieldname is groupname
• Optional fieldnames are description, enrolmentkey, picture, hidepicture';

$string['importgroups_link'] = 'group/import';