$ ag "= *'.*license" --php | grep lang | grep -v '//' | grep -v 'License for the specific'

repository/flickr_public/lang/en/repository_flickr_public.php:29:$string['by'] = 'Attribution license';
repository/flickr_public/lang/en/repository_flickr_public.php:30:$string['by-nc'] = 'Attribution-NonCommercial license';
repository/flickr_public/lang/en/repository_flickr_public.php:31:$string['by-nc-nd'] = 'Attribution-NonCommercial-NoDerivs license';
repository/flickr_public/lang/en/repository_flickr_public.php:32:$string['by-nc-sa'] = 'Attribution-NonCommercial-ShareAlike license';
repository/flickr_public/lang/en/repository_flickr_public.php:33:$string['by-nd'] = 'Attribution-NoDerivs license';
repository/flickr_public/lang/en/repository_flickr_public.php:34:$string['by-sa'] = 'Attribution-ShareAlike license';
repository/flickr_public/lang/en/repository_flickr_public.php:44:$string['license'] = 'License';
repository/merlot/lang/en/repository_merlot.php:27:$string['licensekey'] = 'License key';
admin/tool/licensemanager/lang/en/tool_licensemanager.php:42:$string['privacy:metadata'] = 'The tool_licensemanager plugin stores no personal data.';
lang/en/install.php:49:$string['climustagreelicense'] = 'In non interactive mode you must agree to license by specifying --agree-license option';
lang/en/hub.php:73:$string['licence_link'] = 'licenses';
lang/en/files.php:34:$string['privacy:metadata:files:license'] = 'The license of the file\'s content';
lang/en/h5p.php:33:$string['additionallicenseinfo'] = 'Any additional information about the license';
lang/en/h5p.php:89:$string['gpl'] = 'General Public License v3';
lang/en/h5p.php:125:$string['license'] = 'License';
lang/en/h5p.php:133:$string['licenseGPL'] = 'General Public License';
lang/en/h5p.php:137:$string['licensee'] = 'Licensee';
lang/en/h5p.php:138:$string['licenseextras'] = 'License extras';
lang/en/h5p.php:139:$string['licenseversion'] = 'License version';
lang/en/moodle.php:927:$string['gpllicense'] = 'GPL license';
lib/editor/tinymce/lang/en/editor_tinymce.php:121:$string['advanced_dlg:about_license'] = 'License';
h5p/h5plib/v124/lang/en/h5plib_v124.php:42:$string['editor:changelogdescription'] = 'Some licenses require that changes made to the original work, or derivatives are logged and displayed. You may log your changes here for licensing reasons or just to allow yourself and others to keep track of the changes made to this content.';
h5p/h5plib/v124/lang/en/h5plib_v124.php:64:$string['editor:contenttypelicensepaneltitle'] = 'License';