Incorrect camel case.

[danmarsden]

Moodle uses sentence case - strings like: $string['setupheading'] = 'Annoto Setup'; $string['appsetingsheading'] = 'Annoto Settings'; $string['cta'] = 'Call To Action';

Should be: $string['setupheading'] = 'Annoto setup'; $string['appsetingsheading'] = 'Annoto settings'; $string['cta'] = 'Call to action';

Please review all your lang strings.

[danmarsden]

Also: $string['filtername'] = 'Filter Annoto'; $string['pluginname'] = 'Filter Annoto';

Should really be something like: $string['filtername'] = 'Annoto'; $string['pluginname'] = 'Annoto';

Or maybe something like: $string['filtername'] = 'Annoto social video'; $string['pluginname'] = 'Annoto social video';

The main point is that the word "filter" shouldn't really be part of the pluginname (see other moodle filters for examples)