diff --git a/actions/avatarsettings.php b/actions/avatarsettings.php
index d9542a39c8..7cc55e1e3f 100644
--- a/actions/avatarsettings.php
+++ b/actions/avatarsettings.php
@@ -277,6 +277,7 @@ class AvatarsettingsAction extends SettingsAction
 
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                                'Try again, please.'));
             return;
diff --git a/actions/cancelsubscription.php b/actions/cancelsubscription.php
index 0cd922ff70..30726e0d04 100644
--- a/actions/cancelsubscription.php
+++ b/actions/cancelsubscription.php
@@ -71,6 +71,7 @@ class CancelsubscriptionAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. ' .
                                  'Try again, please.'));
             return;
diff --git a/actions/deleteapplication.php b/actions/deleteapplication.php
index 9f9ac18971..8c3b8e0ba7 100644
--- a/actions/deleteapplication.php
+++ b/actions/deleteapplication.php
@@ -99,6 +99,7 @@ class DeleteapplicationAction extends Action
             // CSRF protection
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->clientError(_('There was a problem with your session token.'));
                 return;
             }
diff --git a/actions/deletenotice.php b/actions/deletenotice.php
index c997bb756a..9032de8974 100644
--- a/actions/deletenotice.php
+++ b/actions/deletenotice.php
@@ -174,6 +174,7 @@ class DeletenoticeAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. ' .
                               'Try again, please.'));
             return;
diff --git a/actions/editapplication.php b/actions/editapplication.php
index 4e67d9e57b..02fae3eb49 100644
--- a/actions/editapplication.php
+++ b/actions/editapplication.php
@@ -128,6 +128,7 @@ class EditApplicationAction extends OwnerDesignAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token.'));
             return;
         }
diff --git a/actions/emailsettings.php b/actions/emailsettings.php
index b3bd6d104c..d515715eda 100644
--- a/actions/emailsettings.php
+++ b/actions/emailsettings.php
@@ -289,6 +289,7 @@ class EmailsettingsAction extends SettingsAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->show_form(_('There was a problem with your session token. '.
                                'Try again, please.'));
             return;
diff --git a/actions/favor.php b/actions/favor.php
index 61db235738..494648f671 100644
--- a/actions/favor.php
+++ b/actions/favor.php
@@ -72,6 +72,7 @@ class FavorAction extends Action
         $notice = Notice::staticGet($id);
         $token  = $this->trimmed('token-'.$notice->id);
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/geocode.php b/actions/geocode.php
index 123a839f56..9e208914c1 100644
--- a/actions/geocode.php
+++ b/actions/geocode.php
@@ -52,6 +52,7 @@ class GeocodeAction extends Action
         parent::prepare($args);
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. '.
                                  'Try again, please.'));
         }
diff --git a/actions/groupblock.php b/actions/groupblock.php
index d426563d8c..3f8cb90e9e 100644
--- a/actions/groupblock.php
+++ b/actions/groupblock.php
@@ -62,6 +62,7 @@ class GroupblockAction extends RedirectingAction
         }
         $token = $this->trimmed('token');
         if (empty($token) || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/groupunblock.php b/actions/groupunblock.php
index de0af59821..7b92e83f71 100644
--- a/actions/groupunblock.php
+++ b/actions/groupunblock.php
@@ -62,6 +62,7 @@ class GroupunblockAction extends Action
         }
         $token = $this->trimmed('token');
         if (empty($token) || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/imsettings.php b/actions/imsettings.php
index b887fdb231..e809981a3f 100644
--- a/actions/imsettings.php
+++ b/actions/imsettings.php
@@ -240,6 +240,7 @@ class ImsettingsAction extends SettingsAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;
diff --git a/actions/invite.php b/actions/invite.php
index bbb6b26c11..7a1f8b3f5b 100644
--- a/actions/invite.php
+++ b/actions/invite.php
@@ -57,6 +57,7 @@ class InviteAction extends CurrentUserDesignAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/makeadmin.php b/actions/makeadmin.php
index 3613e1eb70..0ca537f755 100644
--- a/actions/makeadmin.php
+++ b/actions/makeadmin.php
@@ -64,6 +64,7 @@ class MakeadminAction extends RedirectingAction
         }
         $token = $this->trimmed('token');
         if (empty($token) || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/newapplication.php b/actions/newapplication.php
index a2c4f58b8d..ca5d902a26 100644
--- a/actions/newapplication.php
+++ b/actions/newapplication.php
@@ -109,6 +109,7 @@ class NewApplicationAction extends OwnerDesignAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token.'));
             return;
         }
diff --git a/actions/newmessage.php b/actions/newmessage.php
index 8a03aebfac..8f185b55b5 100644
--- a/actions/newmessage.php
+++ b/actions/newmessage.php
@@ -137,6 +137,7 @@ class NewmessageAction extends Action
 
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. ' .
                 'Try again, please.'));
             return;
diff --git a/actions/newnotice.php b/actions/newnotice.php
index f48134c3b2..3b7cabaced 100644
--- a/actions/newnotice.php
+++ b/actions/newnotice.php
@@ -101,6 +101,7 @@ class NewnoticeAction extends Action
             // CSRF protection
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->clientError(_('There was a problem with your session token. '.
                                      'Try again, please.'));
             }
diff --git a/actions/nudge.php b/actions/nudge.php
index 61874c7505..401285b9f3 100644
--- a/actions/nudge.php
+++ b/actions/nudge.php
@@ -78,6 +78,7 @@ class NudgeAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
diff --git a/actions/oauthconnectionssettings.php b/actions/oauthconnectionssettings.php
index bcef773ac6..5c66730931 100644
--- a/actions/oauthconnectionssettings.php
+++ b/actions/oauthconnectionssettings.php
@@ -132,6 +132,7 @@ class OauthconnectionssettingsAction extends SettingsAction
 
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;
diff --git a/actions/passwordsettings.php b/actions/passwordsettings.php
index d9a6d32ae0..3ac1a3f946 100644
--- a/actions/passwordsettings.php
+++ b/actions/passwordsettings.php
@@ -143,6 +143,7 @@ class PasswordsettingsAction extends SettingsAction
 
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                                'Try again, please.'));
             return;
diff --git a/actions/pluginenable.php b/actions/pluginenable.php
index 0f2b4ba670..4caa6baf37 100644
--- a/actions/pluginenable.php
+++ b/actions/pluginenable.php
@@ -84,6 +84,7 @@ class PluginEnableAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token.'.
                                  ' Try again, please.'));
             return false;
diff --git a/actions/register.php b/actions/register.php
index 084e3e6f1d..d8f752d2bb 100644
--- a/actions/register.php
+++ b/actions/register.php
@@ -160,6 +160,7 @@ class RegisterAction extends Action
         if (Event::handle('StartRegistrationTry', array($this))) {
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->showForm(_('There was a problem with your session token. '.
                                   'Try again, please.'));
                 return;
diff --git a/actions/remotesubscribe.php b/actions/remotesubscribe.php
index 66cee65cab..5514b9a98c 100644
--- a/actions/remotesubscribe.php
+++ b/actions/remotesubscribe.php
@@ -74,6 +74,7 @@ class RemotesubscribeAction extends Action
             /* Use a session token for CSRF protection. */
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->showForm(_('There was a problem with your session token. '.
                                   'Try again, please.'));
                 return;
diff --git a/actions/repeat.php b/actions/repeat.php
index 44c57456fa..333e1cd02e 100644
--- a/actions/repeat.php
+++ b/actions/repeat.php
@@ -76,6 +76,7 @@ class RepeatAction extends Action
         $token  = $this->trimmed('token-'.$id);
 
         if (empty($token) || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return false;
         }
diff --git a/actions/showapplication.php b/actions/showapplication.php
index 38e6f1953e..c9cdbf1848 100644
--- a/actions/showapplication.php
+++ b/actions/showapplication.php
@@ -113,6 +113,7 @@ class ShowApplicationAction extends OwnerDesignAction
             // CSRF protection
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->clientError(_('There was a problem with your session token.'));
                 return;
             }
diff --git a/actions/smssettings.php b/actions/smssettings.php
index 1545679c17..d151ff45d6 100644
--- a/actions/smssettings.php
+++ b/actions/smssettings.php
@@ -246,6 +246,7 @@ class SmssettingsAction extends SettingsAction
 
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;
diff --git a/actions/subedit.php b/actions/subedit.php
index 3b77aff584..f8b22d72b9 100644
--- a/actions/subedit.php
+++ b/actions/subedit.php
@@ -37,6 +37,7 @@ class SubeditAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. '.
                                  'Try again, please.'));
             return false;
diff --git a/actions/tagother.php b/actions/tagother.php
index 518c707201..6d63ea5b5e 100644
--- a/actions/tagother.php
+++ b/actions/tagother.php
@@ -153,6 +153,7 @@ class TagotherAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;
diff --git a/actions/unsubscribe.php b/actions/unsubscribe.php
index 8f90619f64..73661a4f16 100644
--- a/actions/unsubscribe.php
+++ b/actions/unsubscribe.php
@@ -66,6 +66,7 @@ class UnsubscribeAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->clientError(_('There was a problem with your session token. ' .
                                  'Try again, please.'));
             return;
diff --git a/actions/urlsettings.php b/actions/urlsettings.php
index aaaa1b78dd..02a895955d 100644
--- a/actions/urlsettings.php
+++ b/actions/urlsettings.php
@@ -167,6 +167,7 @@ class UrlsettingsAction extends SettingsAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;
diff --git a/actions/userauthorization.php b/actions/userauthorization.php
index e58a096bac..fd01cd7c02 100644
--- a/actions/userauthorization.php
+++ b/actions/userauthorization.php
@@ -50,6 +50,7 @@ class UserauthorizationAction extends Action
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
                 $srv = $this->getStoredParams();
+                // TRANS: Client error displayed when the session token does not match or is not given.
                 $this->showForm($srv->getRemoteUser(), _('There was a problem ' .
                                         'with your session token. Try again, ' .
                                         'please.'));
diff --git a/lib/designsettings.php b/lib/designsettings.php
index eb3a5908e6..e88bbf88cf 100644
--- a/lib/designsettings.php
+++ b/lib/designsettings.php
@@ -119,6 +119,7 @@ class DesignSettingsAction extends SettingsAction
         // CSRF protection
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
+            // TRANS: Client error displayed when the session token does not match or is not given.
             $this->showForm(_('There was a problem with your session token. '.
                               'Try again, please.'));
             return;