Add strings

en.json

@@ -439,9 +439,11 @@
                     "profile": "Profile",
                     "mutual_friends": "Mutual Friends",
                     "mutual_groups": "Mutual Groups",
+                    "mutual_servers": "Mutual Servers",
                     "empty": "It's a bit empty in here…",
                     "no_users": "No mutual friends!",
                     "no_groups": "No mutual groups!",
+                    "no_servers": "No mutual servers!",
                     "sub": {
                         "badges": "Badges",
                         "information": "Information",