Add strings.

en.json

@@ -270,8 +270,8 @@
                     "confirm_leave_long": "You won't be able to rejoin unless you are re-invited.",
                     "confirm_close_dm": "Close conversation with {{name}}?",
                     "confirm_close_dm_long": "You can re-open it later but it will disappear on both sides.",
-                    "confirm_delete_server": "Delete {{name}}?",
-                    "confirm_delete_server_long": "Once a server is deleted, there's no going back."
+                    "confirm_delete": "Delete {{name}}?",
+                    "confirm_delete_long": "Once it's deleted, there's no going back."
                 },
                 "account": {
                     "change": {
@@ -351,6 +351,11 @@
             "custom_status": "Custom Status",
             "clear_status": "Clear Status",
             "set_custom_status": "Set a custom status",
+            "leave_group": "Leave Group",
+            "leave_server": "Leave Server",
+            "close_dm": "Close DM",
+            "delete_server": "Delete Server",
+            "delete_channel": "Delete Channel",
             "open_channel_settings": "Channel Settings",
             "open_server_settings": "Server Settings",
             "open_group_settings": "Group Settings"