With the task plugin in the Details tab, the entry for "Type ID" is "PLG_TASK_SCHUWEBSITEMAP", but this is not a translatable text in the source code, instead it is the name for the array within the TASK_MAP constant of the available task functions. Maybe you should change the name to something more descriptive e.g. "SchuWebSitemap.updateXml".
With the task plugin in the Details tab, the entry for "Type ID" is "PLG_TASK_SCHUWEBSITEMAP", but this is not a translatable text in the source code, instead it is the name for the array within the TASK_MAP constant of the available task functions. Maybe you should change the name to something more descriptive e.g. "SchuWebSitemap.updateXml".
https://extensions.schultschik.com/support-forum/schuweb-sitemap/132-sitemap-v5-1-0#523