diff --git a/plugins/OpenID/OpenIDPlugin.php b/plugins/OpenID/OpenIDPlugin.php
index 270e2c624b..6b723ad10f 100644
--- a/plugins/OpenID/OpenIDPlugin.php
+++ b/plugins/OpenID/OpenIDPlugin.php
@@ -202,16 +202,16 @@ class OpenIDPlugin extends Plugin
         if ($this->openidOnly && !common_logged_in()) {
             // TRANS: Tooltip for main menu option "Login"
             $tooltip = _m('TOOLTIP', 'Login to the site');
-            // TRANS: Main menu option when not logged in to log in
             $action->menuItem(common_local_url('openidlogin'),
+                              // TRANS: Main menu option when not logged in to log in
                               _m('MENU', 'Login'),
                               $tooltip,
                               false,
                               'nav_login');
             // TRANS: Tooltip for main menu option "Help"
             $tooltip = _m('TOOLTIP', 'Help me!');
-            // TRANS: Main menu option for help on the StatusNet site
             $action->menuItem(common_local_url('doc', array('title' => 'help')),
+                              // TRANS: Main menu option for help on the StatusNet site
                               _m('MENU', 'Help'),
                               $tooltip,
                               false,
@@ -219,8 +219,8 @@ class OpenIDPlugin extends Plugin
             if (!common_config('site', 'private')) {
                 // TRANS: Tooltip for main menu option "Search"
                 $tooltip = _m('TOOLTIP', 'Search for people or text');
-                // TRANS: Main menu option when logged in or when the StatusNet instance is not private
                 $action->menuItem(common_local_url('peoplesearch'),
+                                  // TRANS: Main menu option when logged in or when the StatusNet instance is not private
                                   _m('MENU', 'Search'), $tooltip, false, 'nav_search');
             }
             Event::handle('EndPrimaryNav', array($action));
@@ -280,7 +280,9 @@ class OpenIDPlugin extends Plugin
         $action_name = $action->trimmed('action');
 
         $action->menuItem(common_local_url('openidlogin'),
-                          _m('OpenID'),
+                          // TRANS: OpenID plugin menu item on site logon page.
+                          _m('MENU', 'OpenID'),
+                          // TRANS: OpenID plugin tooltip for logon menu item.
                           _m('Login or register with OpenID'),
                           $action_name === 'openidlogin');
     }
@@ -316,7 +318,9 @@ class OpenIDPlugin extends Plugin
         $action_name = $action->trimmed('action');
 
         $action->menuItem(common_local_url('openidsettings'),
-                          _m('OpenID'),
+                          // TRANS: OpenID plugin menu item on user settings page.
+                          _m('MENU', 'OpenID'),
+                          // TRANS: OpenID plugin tooltip for user settings menu item.
                           _m('Add or remove OpenIDs'),
                           $action_name === 'openidsettings');
 
@@ -592,6 +596,7 @@ class OpenIDPlugin extends Plugin
                             'author' => 'Evan Prodromou, Craig Andrews',
                             'homepage' => 'http://status.net/wiki/Plugin:OpenID',
                             'rawdescription' =>
+                            // TRANS: OpenID plugin description.
                             _m('Use <a href="http://openid.net/">OpenID</a> to login to the site.'));
         return true;
     }
diff --git a/plugins/OpenID/finishaddopenid.php b/plugins/OpenID/finishaddopenid.php
index 991e6584ee..77fcc3805d 100644
--- a/plugins/OpenID/finishaddopenid.php
+++ b/plugins/OpenID/finishaddopenid.php
@@ -64,6 +64,7 @@ class FinishaddopenidAction extends Action
     {
         parent::handle($args);
         if (!common_logged_in()) {
+            // TRANS: Client error message
             $this->clientError(_m('Not logged in.'));
         } else {
             $this->tryLogin();
@@ -85,10 +86,12 @@ class FinishaddopenidAction extends Action
         $response = $consumer->complete(common_local_url('finishaddopenid'));
 
         if ($response->status == Auth_OpenID_CANCEL) {
+            // TRANS: Status message in case the response from the OpenID provider is that the logon attempt was cancelled.
             $this->message(_m('OpenID authentication cancelled.'));
             return;
         } else if ($response->status == Auth_OpenID_FAILURE) {
-            // Authentication failed; display the error message.
+            // TRANS: OpenID authentication failed; display the error message.
+            // TRANS: %s is the error message.
             $this->message(sprintf(_m('OpenID authentication failed: %s'),
                                    $response->message));
         } else if ($response->status == Auth_OpenID_SUCCESS) {
@@ -109,8 +112,10 @@ class FinishaddopenidAction extends Action
 
             if ($other) {
                 if ($other->id == $cur->id) {
+                    // TRANS: message in case a user tries to add an OpenID that is already connected to them.
                     $this->message(_m('You already have this OpenID!'));
                 } else {
+                    // TRANS: message in case a user tries to add an OpenID that is already used by another user.
                     $this->message(_m('Someone else already has this OpenID.'));
                 }
                 return;
@@ -123,11 +128,13 @@ class FinishaddopenidAction extends Action
             $result = oid_link_user($cur->id, $canonical, $display);
 
             if (!$result) {
+                // TRANS: message in case the OpenID object cannot be connected to the user.
                 $this->message(_m('Error connecting user.'));
                 return;
             }
             if ($sreg) {
                 if (!oid_update_user($cur, $sreg)) {
+                    // TRANS: message in case the user or the user profile cannot be saved in StatusNet.
                     $this->message(_m('Error updating profile'));
                     return;
                 }
@@ -167,6 +174,7 @@ class FinishaddopenidAction extends Action
 
     function title()
     {
+        // TRANS: Title after getting the status of the OpenID authorisation request.
         return _m('OpenID Login');
     }
 
diff --git a/plugins/OpenID/finishopenidlogin.php b/plugins/OpenID/finishopenidlogin.php
index 32b092a0bd..5b1a7cee09 100644
--- a/plugins/OpenID/finishopenidlogin.php
+++ b/plugins/OpenID/finishopenidlogin.php
@@ -31,15 +31,18 @@ class FinishopenidloginAction extends Action
     {
         parent::handle($args);
         if (common_is_real_login()) {
+            // TRANS: Client error message trying to log on with OpenID while already logged on.
             $this->clientError(_m('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Message given when there is a problem with the user's session token.
                 $this->showForm(_m('There was a problem with your session token. Try again, please.'));
                 return;
             }
             if ($this->arg('create')) {
                 if (!$this->boolean('license')) {
+                    // TRANS: Message given if user does not agree with the site's license.
                     $this->showForm(_m('You can\'t register if you don\'t agree to the license.'),
                                     $this->trimmed('newname'));
                     return;
@@ -48,7 +51,8 @@ class FinishopenidloginAction extends Action
             } else if ($this->arg('connect')) {
                 $this->connectUser();
             } else {
-                $this->showForm(_m('Something weird happened.'),
+                // TRANS: Messag given on an unknown error.
+                $this->showForm(_m('An unknown error has occured.'),
                                 $this->trimmed('newname'));
             }
         } else {
@@ -62,12 +66,15 @@ class FinishopenidloginAction extends Action
             $this->element('div', array('class' => 'error'), $this->error);
         } else {
             $this->element('div', 'instructions',
+                           // TRANS: Instructions given after a first successful logon using OpenID.
+                           // TRANS: %s is the site name.
                            sprintf(_m('This is the first time you\'ve logged into %s so we must connect your OpenID to a local account. You can either create a new account, or connect with your existing account, if you have one.'), common_config('site', 'name')));
         }
     }
 
     function title()
     {
+        // TRANS: Title
         return _m('OpenID Account Setup');
     }
 
@@ -115,6 +122,8 @@ class FinishopenidloginAction extends Action
                                       'value' => 'true'));
         $this->elementStart('label', array('for' => 'license',
                                           'class' => 'checkbox'));
+        // TRANS: OpenID plugin link text.
+        // TRANS: %s is a link to a licese with the license name as link text.
         $message = _('My text and files are available under %s ' .
                      'except this private data: password, ' .
                      'email address, IM address, and phone number.');
@@ -127,23 +136,29 @@ class FinishopenidloginAction extends Action
         $this->elementEnd('label');
         $this->elementEnd('li');
         $this->elementEnd('ul');
-        $this->submit('create', _m('Create'));
+        // TRANS: Button label in form in which to create a new user on the site for an OpenID.
+        $this->submit('create', _m('BUTTON', 'Create'));
         $this->elementEnd('fieldset');
 
         $this->elementStart('fieldset', array('id' => 'form_openid_createaccount'));
         $this->element('legend', null,
+                       // TRANS: Used as form legend for form in which to connect an OpenID to an existing user on the site.
                        _m('Connect existing account'));
         $this->element('p', null,
+                       // TRANS: User instructions for form in which to connect an OpenID to an existing user on the site.
                        _m('If you already have an account, login with your username and password to connect it to your OpenID.'));
         $this->elementStart('ul', 'form_data');
         $this->elementStart('li');
+        // TRANS: Field label in form in which to connect an OpenID to an existing user on the site.
         $this->input('nickname', _m('Existing nickname'));
         $this->elementEnd('li');
         $this->elementStart('li');
+        // TRANS: Field label in form in which to connect an OpenID to an existing user on the site.
         $this->password('password', _m('Password'));
         $this->elementEnd('li');
         $this->elementEnd('ul');
-        $this->submit('connect', _m('Connect'));
+        // TRANS: Button label in form in which to connect an OpenID to an existing user on the site.
+        $this->submit('connect', _m('BUTTON', 'Connect'));
         $this->elementEnd('fieldset');
         $this->elementEnd('form');
     }
@@ -155,10 +170,11 @@ class FinishopenidloginAction extends Action
         $response = $consumer->complete(common_local_url('finishopenidlogin'));
 
         if ($response->status == Auth_OpenID_CANCEL) {
+            // TRANS: Status message in case the response from the OpenID provider is that the logon attempt was cancelled.
             $this->message(_m('OpenID authentication cancelled.'));
             return;
         } else if ($response->status == Auth_OpenID_FAILURE) {
-            // Authentication failed; display the error message.
+            // TRANS: OpenID authentication failed; display the error message. %s is the error message.
             $this->message(sprintf(_m('OpenID authentication failed: %s'), $response->message));
         } else if ($response->status == Auth_OpenID_SUCCESS) {
             // This means the authentication succeeded; extract the
@@ -224,6 +240,7 @@ class FinishopenidloginAction extends Action
         # FIXME: save invite code before redirect, and check here
 
         if (common_config('site', 'closed')) {
+            // TRANS: OpenID plugin message. No new user registration is allowed on the site.
             $this->clientError(_m('Registration not allowed.'));
             return;
         }
@@ -233,6 +250,7 @@ class FinishopenidloginAction extends Action
         if (common_config('site', 'inviteonly')) {
             $code = $_SESSION['invitecode'];
             if (empty($code)) {
+                // TRANS: OpenID plugin message. No new user registration is allowed on the site without an invitation code, and none was provided.
                 $this->clientError(_m('Registration not allowed.'));
                 return;
             }
@@ -240,6 +258,7 @@ class FinishopenidloginAction extends Action
             $invite = Invitation::staticGet($code);
 
             if (empty($invite)) {
+                // TRANS: OpenID plugin message. No new user registration is allowed on the site without an invitation code, and the one provided was not valid.
                 $this->clientError(_m('Not a valid invitation code.'));
                 return;
             }
@@ -250,16 +269,19 @@ class FinishopenidloginAction extends Action
         if (!Validate::string($nickname, array('min_length' => 1,
                                                'max_length' => 64,
                                                'format' => NICKNAME_FMT))) {
+            // TRANS: OpenID plugin message. The entered new user name did not conform to the requirements.
             $this->showForm(_m('Nickname must have only lowercase letters and numbers and no spaces.'));
             return;
         }
 
         if (!User::allowed_nickname($nickname)) {
+            // TRANS: OpenID plugin message. The entered new user name is blacklisted.
             $this->showForm(_m('Nickname not allowed.'));
             return;
         }
 
         if (User::staticGet('nickname', $nickname)) {
+            // TRANS: OpenID plugin message. The entered new user name is already used.
             $this->showForm(_m('Nickname already in use. Try another one.'));
             return;
         }
@@ -267,6 +289,7 @@ class FinishopenidloginAction extends Action
         list($display, $canonical, $sreg) = $this->getSavedValues();
 
         if (!$display || !$canonical) {
+            // TRANS: OpenID plugin server error. A stored OpenID cannot be retrieved.
             $this->serverError(_m('Stored OpenID not found.'));
             return;
         }
@@ -276,6 +299,7 @@ class FinishopenidloginAction extends Action
         $other = oid_get_user($canonical);
 
         if ($other) {
+            // TRANS: OpenID plugin server error.
             $this->serverError(_m('Creating new account for OpenID that already has a user.'));
             return;
         }
@@ -336,6 +360,7 @@ class FinishopenidloginAction extends Action
         $password = $this->trimmed('password');
 
         if (!common_check_user($nickname, $password)) {
+            // TRANS: OpenID plugin message.
             $this->showForm(_m('Invalid username or password.'));
             return;
         }
@@ -347,6 +372,7 @@ class FinishopenidloginAction extends Action
         list($display, $canonical, $sreg) = $this->getSavedValues();
 
         if (!$display || !$canonical) {
+            // TRANS: OpenID plugin server error. A stored OpenID cannot be found.
             $this->serverError(_m('Stored OpenID not found.'));
             return;
         }
@@ -354,6 +380,7 @@ class FinishopenidloginAction extends Action
         $result = oid_link_user($user->id, $canonical, $display);
 
         if (!$result) {
+            // TRANS: OpenID plugin server error. The user or user profile could not be saved.
             $this->serverError(_m('Error connecting user to OpenID.'));
             return;
         }
diff --git a/plugins/OpenID/openid.php b/plugins/OpenID/openid.php
index 4ec336e1c3..68b5c29e24 100644
--- a/plugins/OpenID/openid.php
+++ b/plugins/OpenID/openid.php
@@ -134,6 +134,7 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
     $consumer = oid_consumer();
 
     if (!$consumer) {
+        // TRANS: OpenID plugin server error.
         common_server_error(_m('Cannot instantiate OpenID consumer object.'));
         return false;
     }
@@ -144,8 +145,11 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
 
     // Handle failure status return values.
     if (!$auth_request) {
+        // TRANS: OpenID plugin message. Given when an OpenID is not valid.
         return _m('Not a valid OpenID.');
     } else if (Auth_OpenID::isFailure($auth_request)) {
+        // TRANS: OpenID plugin server error. Given when the OpenID authentication request fails.
+        // TRANS: %s is the failure message.
         return sprintf(_m('OpenID failure: %s'), $auth_request->message);
     }
 
@@ -173,6 +177,8 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
                                                    $immediate);
         if (!$redirect_url) {
         } else if (Auth_OpenID::isFailure($redirect_url)) {
+            // TRANS: OpenID plugin server error. Given when the OpenID authentication request cannot be redirected.
+            // TRANS: %s is the failure message.
             return sprintf(_m('Could not redirect to server: %s'), $redirect_url->message);
         } else {
             common_redirect($redirect_url, 303);
@@ -191,6 +197,8 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
         // Display an error if the form markup couldn't be generated;
         // otherwise, render the HTML.
         if (Auth_OpenID::isFailure($form_html)) {
+            // TRANS: OpenID plugin server error if the form markup could not be generated.
+            // TRANS: %s is the failure message.
             common_server_error(sprintf(_m('Could not create OpenID form: %s'), $form_html->message));
         } else {
             $action = new AutosubmitAction(); // see below
@@ -207,6 +215,7 @@ function oid_authenticate($openid_url, $returnto, $immediate=false)
 function _oid_print_instructions()
 {
     common_element('div', 'instructions',
+                   // TRANS: OpenID plugin user instructions.
                    _m('This form should automatically submit itself. '.
                       'If not, click the submit button to go to your '.
                       'OpenID provider.'));
@@ -239,6 +248,7 @@ function oid_update_user(&$user, &$sreg)
     # XXX save timezone if it's passed
 
     if (!$profile->update($orig_profile)) {
+        // TRANS: OpenID plugin server error.
         common_server_error(_m('Error saving the profile.'));
         return false;
     }
@@ -250,6 +260,7 @@ function oid_update_user(&$user, &$sreg)
     }
 
     if (!$user->update($orig_user)) {
+        // TRANS: OpenID plugin server error.
         common_server_error(_m('Error saving the user.'));
         return false;
     }
@@ -279,6 +290,7 @@ function oid_assert_allowed($url)
                     return;
                 }
             }
+            // TRANS: OpenID plugin client exception (403).
             throw new ClientException(_m("Unauthorized URL used for OpenID login."), 403);
         }
     }
@@ -299,6 +311,7 @@ class AutosubmitAction extends Action
 
     function title()
     {
+        // TRANS: Title
         return _m('OpenID Login Submission');
     }
 
@@ -309,9 +322,11 @@ class AutosubmitAction extends Action
         $this->element('img', array('src' => Theme::path('images/icons/icon_processing.gif', 'base'),
                                     // for some reason the base CSS sets <img>s as block display?!
                                     'style' => 'display: inline'));
+        // TRANS: OpenID plugin message used while requesting authorization user's OpenID login provider.
         $this->text(_m('Requesting authorization from your login provider...'));
         $this->raw('</p>');
         $this->raw('<p style="margin-top: 60px; font-style: italic">');
+        // TRANS: OpenID plugin message. User instruction while requesting authorization user's OpenID login provider.
         $this->text(_m('If you are not redirected to your login provider in a few seconds, try pushing the button below.'));
         $this->raw('</p>');
         $this->raw($this->form_html);
diff --git a/plugins/OpenID/openidlogin.php b/plugins/OpenID/openidlogin.php
index 2a743672cf..ec05daeb18 100644
--- a/plugins/OpenID/openidlogin.php
+++ b/plugins/OpenID/openidlogin.php
@@ -27,6 +27,7 @@ class OpenidloginAction extends Action
     {
         parent::handle($args);
         if (common_is_real_login()) {
+            // TRANS: Client error message trying to log on with OpenID while already logged on.
             $this->clientError(_m('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $openid_url = $this->trimmed('openid_url');
@@ -36,6 +37,7 @@ class OpenidloginAction extends Action
             # CSRF protection
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
+                // TRANS: Message given when there is a problem with the user's session token.
                 $this->showForm(_m('There was a problem with your session token. Try again, please.'), $openid_url);
                 return;
             }
@@ -65,10 +67,14 @@ class OpenidloginAction extends Action
             common_get_returnto()) {
             // rememberme logins have to reauthenticate before
             // changing any profile settings (cookie-stealing protection)
+            // TRANS: OpenID plugin message. Rememberme logins have to reauthenticate before changing any profile settings.
+            // TRANS: "OpenID" is the display text for a link with URL "(%%doc.openid%%)".
             return _m('For security reasons, please re-login with your ' .
                      '[OpenID](%%doc.openid%%) ' .
                      'before changing your settings.');
         } else {
+            // TRANS: OpenID plugin message.
+            // TRANS: "OpenID" is the display text for a link with URL "(%%doc.openid%%)".
             return _m('Login with an [OpenID](%%doc.openid%%) account.');
         }
     }
@@ -94,6 +100,7 @@ class OpenidloginAction extends Action
 
     function title()
     {
+        // TRANS: OpenID plugin message. Title.
         return _m('OpenID Login');
     }
 
@@ -111,22 +118,28 @@ class OpenidloginAction extends Action
                                            'class' => 'form_settings',
                                            'action' => $formaction));
         $this->elementStart('fieldset');
+        // TRANS: OpenID plugin logon form legend.
         $this->element('legend', null, _m('OpenID login'));
         $this->hidden('token', common_session_token());
 
         $this->elementStart('ul', 'form_data');
         $this->elementStart('li');
+        // TRANS: OpenID plugin logon form field label.
         $this->input('openid_url', _m('OpenID URL'),
                      $this->openid_url,
+                     // TRANS: OpenID plugin logon form field instructions.
                      _m('Your OpenID URL'));
         $this->elementEnd('li');
         $this->elementStart('li', array('id' => 'settings_rememberme'));
+        // TRANS: OpenID plugin logon form checkbox label for setting to put the OpenID information in a cookie.
         $this->checkbox('rememberme', _m('Remember me'), false,
+                        // TRANS: OpenID plugin logon form field instructions.
                         _m('Automatically login in the future; ' .
                            'not for shared computers!'));
         $this->elementEnd('li');
         $this->elementEnd('ul');
-        $this->submit('submit', _m('Login'));
+        // TRANS: OpenID plugin logon form button label to start logon with the data provided in the logon form.
+        $this->submit('submit', _m('BUTTON', 'Login'));
         $this->elementEnd('fieldset');
         $this->elementEnd('form');
     }
diff --git a/plugins/OpenID/openidserver.php b/plugins/OpenID/openidserver.php
index a31596a107..f7e3a45f20 100644
--- a/plugins/OpenID/openidserver.php
+++ b/plugins/OpenID/openidserver.php
@@ -103,6 +103,7 @@ class OpenidserverAction extends Action
                 $response = $this->generateDenyResponse($request);
             } else {
                 //invalid
+                // TRANS: OpenID plugin client error given trying to add an unauthorised OpenID to a user (403).
                 $this->clientError(sprintf(_m('You are not authorized to use the identity %s.'),$request->identity),$code=403);
             }
         } else {
@@ -123,6 +124,7 @@ class OpenidserverAction extends Action
             }
             $this->raw($response->body);
         }else{
+            // TRANS: OpenID plugin client error given when not getting a response for a given OpenID provider (500).
             $this->clientError(_m('Just an OpenID provider. Nothing to see here, move along...'),$code=500);
         }
     }