Hi there,
You can change them by going to
Backend>Components>EasySocial>Pages>Categories>*your category>general and change it title as shown
http://screencast.com/t/EcdSg3hm but, you have to set those title a unique string. Maybe you can follow my steps below.
1. Create a unique string for your title (shown above), for example "COM_EASYSOCIAL_GENERAL_CATEGORY_PAGES"
2. Go to this path
.../administrator/language/en-GB/en-GB.com_easysocial.ini
.../language/en-GB/en-GB.com_easysocial.ini
.../administrator/language/de-DE/de-DE.com_easysocial.ini
.../language/de-DE/de-DE.com_easysocial.ini
then set translation for your string, for example COM_EASYSOCIAL_GENERAL_CATEGORY_PAGES="General" (English) and COM_EASYSOCIAL_GENERAL_CATEGORY_PAGES="allgemein".
Please give it a try and see how it goes
Hope this helps