Hi Imservan,
Then you can use this custom css:
.products-toolbar .jamg-layout-chooser { display: none; }
About the language file, here is the default file for English: /language/en-GB/en-GB.com_jamegafilter.ini
You can copy this file to language folder of German >> rename the file >> and translate as you wish:
/language/de-DE/de-DE.com_jamegafilter.ini
Regards