@SpectralFlux Since Opera accepts most Chrome extensions, there are actually only a couple of reasons to make an extension specifically for Opera. As Opera's UI is not like Chrome's, any sort of a sidebar would need to be designed for Opera.
@koyrion: ...so if some 'insane' person was looking to permanently erase portions of a webpage, complete webpages, or maybe ALL WEBPAGES everywhere forevermore via a clickable browser add-on, they're just out of luck...for now! mWAhHAh Ha hA hAh!
Did you manage to resolve the 'Detailed description missing for English.' issue? I'm experiencing the same problem when submitting my addon and would appreciate any advice on how to fix it.