Update strings.

en.json

@@ -80,12 +80,12 @@
                     "several": "Several people are typing…"
                 },
                 "system": {
-                    "user_joined": "{{user}} joined.",
-                    "user_left": "{{user}} left.",
-                    "user_kicked": "{{user}} was kicked.",
-                    "user_banned": "{{user}} was banned.",
-                    "added_by": "{{user}} added by {{other_user}}",
-                    "removed_by": "{{user}} removed by {{other_user}}",
+                    "user_joined": "{{user}} joined",
+                    "user_left": "{{user}} left",
+                    "user_kicked": "{{user}} was kicked",
+                    "user_banned": "{{user}} was banned",
+                    "added_by": "{{user}} was added by {{other_user}}",
+                    "removed_by": "{{user}} was removed by {{other_user}}",
                     "channel_renamed": "{{user}} renamed the channel to {{other_user}}",
                     "channel_description_changed": "{{user}} changed the channel description",
                     "channel_icon_changed": "{{user}} changed the channel icon"