1) Use a proper code editor like notepad++ (http://notepad-plus-plus.org/) 2) When editting, make sure the Encoding (see the top menu of notepad++) is set on UTF-8 (without BOM). 3) Save the file and re-upload it
4/ Slovak can be installed: in languages/ create a Slovak folder copy all files from English to Slovak, filenames containing the string “English_xxx” should be renamed in “Slovak_xxx”