unused lang strings

public/language/en_GB/groups.json

@@ -19,8 +19,6 @@
 	"request.notification_title": "Group Membership Request from <strong>%1</strong>",
 	"request.notification_text": "<strong>%1</strong> has requested to become a member of <strong>%2</strong>",
 
-	"cover-instructions": "Drag and Drop a photo, drag to position, and hit <strong>Save</strong>",
-	"cover-change": "Change",
 	"cover-save": "Save",
 	"cover-saving": "Saving",