compatibility to 2.1.5

Sorry for being so late with this update. It should be now compatible with webtrees 2.1.5.

Thank you for all the contributors to the translations. I know that it is not easy to provide translations for this module. There are new languages supported: Chinese, Catalan, Spanish (updated), and Russian.

There are still several bugs, but I think it should be possible to use this module again. There will be a version 2.1.5.1 in the near future.

It is planned to allow "copy extended family to the clippings cart" in order to visualize them using the new modules "Extended Clippings Cart", "TAM", and "Lineage" (see https://github.com/huhwt/). This function is not finished, so do not activate the corresponding option in the control panel of this module.