diff --git a/vj4/locale/en.yaml b/vj4/locale/en.yaml
index 3d46ac664..bc939fcf7 100644
--- a/vj4/locale/en.yaml
+++ b/vj4/locale/en.yaml
@@ -58,7 +58,7 @@ domain_manage_join_applications: Join Applications
 domain_manage_role: Domain Role
 domain_manage_user: Domain User
 domain_manage_permission: Domain Permission
-timeago_locale: en
+timeago_locale: en_US
 perm_general: General
 perm_problem: Problems
 perm_record: Records
diff --git a/vj4/ui/pages/home_messages.page.js b/vj4/ui/pages/home_messages.page.js
index be9dab5ad..5baf1dae3 100644
--- a/vj4/ui/pages/home_messages.page.js
+++ b/vj4/ui/pages/home_messages.page.js
@@ -40,7 +40,7 @@ const page = new NamedPage('home_messages', () => {
     let heartbeatClock;
     sock.onopen = () => {
       heartbeatClock = setInterval(() => {
-        sock.send(JSON.stringify({}));  // heartbeat
+        sock.send(JSON.stringify({}));
       }, 25000);
     };
     sock.onclose = () => clearInterval(heartbeatClock);
diff --git a/vj4/ui/pages/judge_playground.page.js b/vj4/ui/pages/judge_playground.page.js
index 2d93a017a..a0c18ec12 100644
--- a/vj4/ui/pages/judge_playground.page.js
+++ b/vj4/ui/pages/judge_playground.page.js
@@ -14,7 +14,7 @@ const page = new NamedPage('judge_playground', async () => {
       .appendTo(div);
 
     heartbeatClock = setInterval(() => {
-      sock.send(JSON.stringify({}));  // heartbeat
+      sock.send(JSON.stringify({}));
     }, 25000);
   };
 
diff --git a/vj4/ui/pages/problem_detail.page.js b/vj4/ui/pages/problem_detail.page.js
index 0acfc54de..68f8d795d 100644
--- a/vj4/ui/pages/problem_detail.page.js
+++ b/vj4/ui/pages/problem_detail.page.js
@@ -192,7 +192,7 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
     let heartbeatClock;
     sock.onopen = () => {
       heartbeatClock = setInterval(() => {
-        sock.send(JSON.stringify({}));  // heartbeat
+        sock.send(JSON.stringify({}));
       }, 25000);
     };
     sock.onclose = () => clearInterval(heartbeatClock);
diff --git a/vj4/ui/pages/record_detail.page.js b/vj4/ui/pages/record_detail.page.js
index e2df730a5..bfa8dfbb3 100644
--- a/vj4/ui/pages/record_detail.page.js
+++ b/vj4/ui/pages/record_detail.page.js
@@ -10,7 +10,7 @@ const page = new NamedPage('record_detail', async () => {
   let heartbeatClock;
   sock.onopen = () => {
     heartbeatClock = setInterval(() => {
-      sock.send(JSON.stringify({}));  // heartbeat
+      sock.send(JSON.stringify({}));
     }, 25000);
   };
   sock.onclose = () => clearInterval(heartbeatClock);
diff --git a/vj4/ui/pages/record_main.page.js b/vj4/ui/pages/record_main.page.js
index 9561345ca..1aa58ded3 100644
--- a/vj4/ui/pages/record_main.page.js
+++ b/vj4/ui/pages/record_main.page.js
@@ -11,7 +11,7 @@ const page = new NamedPage('record_main', async () => {
   let heartbeatClock;
   sock.onopen = () => {
     heartbeatClock = setInterval(() => {
-      sock.send(JSON.stringify({}));  // heartbeat
+      sock.send(JSON.stringify({}));
     }, 25000);
   };
   sock.onclose = () => clearInterval(heartbeatClock);