diff --git a/actions/apiaccountupdateprofileimage.php b/actions/apiaccountupdateprofileimage.php
index 7f868a6eb3..1f38bd2204 100644
--- a/actions/apiaccountupdateprofileimage.php
+++ b/actions/apiaccountupdateprofileimage.php
@@ -95,9 +95,11 @@ class ApiAccountUpdateProfileImageAction extends ApiAuthAction
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
         ) {
-             $msg = _('The server was unable to handle that much POST ' .
-                    'data (%s bytes) due to its current configuration.');
-
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->clientError(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
diff --git a/actions/apigroupcreate.php b/actions/apigroupcreate.php
index fa443573d6..1608e030b8 100644
--- a/actions/apigroupcreate.php
+++ b/actions/apigroupcreate.php
@@ -49,7 +49,6 @@ require_once INSTALLDIR . '/lib/apiauth.php';
  * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  * @link     http://status.net/
  */
-
 class ApiGroupCreateAction extends ApiAuthAction
 {
     var $group       = null;
@@ -95,7 +94,6 @@ class ApiGroupCreateAction extends ApiAuthAction
      *
      * @return void
      */
-
     function handle($args)
     {
         parent::handle($args);
@@ -111,6 +109,7 @@ class ApiGroupCreateAction extends ApiAuthAction
         }
 
         if (empty($this->user)) {
+            // TRANS: Client error given when a user was not found (404).
             $this->clientError(_('No such user.'), 404, $this->format);
             return;
         }
@@ -137,13 +136,13 @@ class ApiGroupCreateAction extends ApiAuthAction
             break;
         default:
             $this->clientError(
+                // TRANS: Client error given when an API method was not found (404).
                 _('API method not found.'),
                 404,
                 $this->format
             );
             break;
         }
-
     }
 
     /**
@@ -164,6 +163,7 @@ class ApiGroupCreateAction extends ApiAuthAction
 
         if (!$valid) {
             $this->clientError(
+                // TRANS: Validation error in form for group creation.
                 _(
                     'Nickname must have only lowercase letters ' .
                     'and numbers and no spaces.'
@@ -174,6 +174,7 @@ class ApiGroupCreateAction extends ApiAuthAction
             return false;
         } elseif ($this->groupNicknameExists($this->nickname)) {
             $this->clientError(
+                // TRANS: Client error trying to create a group with a nickname this is already in use.
                 _('Nickname already in use. Try another one.'),
                 403,
                 $this->format
@@ -181,6 +182,7 @@ class ApiGroupCreateAction extends ApiAuthAction
             return false;
         } else if (!User_group::allowedNickname($this->nickname)) {
             $this->clientError(
+                // TRANS: Client error in form for group creation.
                 _('Not a valid nickname.'),
                 403,
                 $this->format
@@ -197,6 +199,7 @@ class ApiGroupCreateAction extends ApiAuthAction
                 )
             )) {
             $this->clientError(
+                // TRANS: Client error in form for group creation.
                 _('Homepage is not a valid URL.'),
                 403,
                 $this->format
@@ -206,7 +209,8 @@ class ApiGroupCreateAction extends ApiAuthAction
             !is_null($this->fullname)
             && mb_strlen($this->fullname) > 255) {
                 $this->clientError(
-                    _('Full name is too long (max 255 chars).'),
+                    // TRANS: Client error in form for group creation.
+                    _('Full name is too long (maximum 255 characters).'),
                     403,
                     $this->format
                 );
@@ -225,7 +229,7 @@ class ApiGroupCreateAction extends ApiAuthAction
             !is_null($this->location)
             && mb_strlen($this->location) > 255) {
                 $this->clientError(
-                    _('Location is too long (max 255 chars).'),
+                    _('Location is too long (maximum 255 characters).'),
                     403,
                     $this->format
                 );
diff --git a/actions/apimediaupload.php b/actions/apimediaupload.php
index 54d7fda68f..a33771caea 100644
--- a/actions/apimediaupload.php
+++ b/actions/apimediaupload.php
@@ -78,9 +78,11 @@ class ApiMediaUploadAction extends ApiAuthAction
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
         ) {
-             $msg = _('The server was unable to handle that much POST ' .
-                    'data (%s bytes) due to its current configuration.');
-
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->clientError(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
diff --git a/actions/avatarsettings.php b/actions/avatarsettings.php
index 52dc2e4249..9d4040e75a 100644
--- a/actions/avatarsettings.php
+++ b/actions/avatarsettings.php
@@ -254,9 +254,11 @@ class AvatarsettingsAction extends AccountSettingsAction
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
         ) {
-            $msg = _('The server was unable to handle that much POST ' .
-                'data (%s bytes) due to its current configuration.');
-
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->showForm(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
diff --git a/actions/designadminpanel.php b/actions/designadminpanel.php
index 199be43ead..321a8ee5eb 100644
--- a/actions/designadminpanel.php
+++ b/actions/designadminpanel.php
@@ -120,8 +120,11 @@ class DesignadminpanelAction extends AdminPanelAction
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
         ) {
-            $msg = _('The server was unable to handle that much POST ' .
-                'data (%s bytes) due to its current configuration.');
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->clientException(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
diff --git a/actions/editapplication.php b/actions/editapplication.php
index 5d23627f1d..d1c7a5c3d5 100644
--- a/actions/editapplication.php
+++ b/actions/editapplication.php
@@ -116,9 +116,11 @@ class EditApplicationAction extends OwnerDesignAction
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
             ) {
-            // TRANS: Client exception. %s is CONTENT_LENGTH (in bytes).
-            $msg = _('The server was unable to handle that much POST ' .
-                     'data (%s bytes) due to its current configuration.');
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->clientException(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
diff --git a/actions/editgroup.php b/actions/editgroup.php
index 4b596cade9..eaadbabe45 100644
--- a/actions/editgroup.php
+++ b/actions/editgroup.php
@@ -199,13 +199,13 @@ class EditgroupAction extends GroupDesignAction
             $this->showForm(_('Homepage is not a valid URL.'));
             return;
         } else if (!is_null($fullname) && mb_strlen($fullname) > 255) {
-            $this->showForm(_('Full name is too long (max 255 chars).'));
+            $this->showForm(_('Full name is too long (maximum 255 characters).'));
             return;
         } else if (User_group::descriptionTooLong($description)) {
-            $this->showForm(sprintf(_('description is too long (max %d chars).'), User_group::maxDescription()));
+            $this->showForm(sprintf(_('Description is too long (max %d chars).'), User_group::maxDescription()));
             return;
         } else if (!is_null($location) && mb_strlen($location) > 255) {
-            $this->showForm(_('Location is too long (max 255 chars).'));
+            $this->showForm(_('Location is too long (maximum 255 characters).'));
             return;
         }
 
diff --git a/actions/newapplication.php b/actions/newapplication.php
index 8b150c3151..033c0852d9 100644
--- a/actions/newapplication.php
+++ b/actions/newapplication.php
@@ -42,14 +42,14 @@ if (!defined('STATUSNET') && !defined('LACONICA')) {
  * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  * @link     http://status.net/
  */
-
 class NewApplicationAction extends OwnerDesignAction
 {
     var $msg;
 
     function title()
     {
-        return _('New Application');
+        // TRANS: This is the title of the form for adding a new application.
+        return _('New application');
     }
 
     /**
@@ -61,6 +61,7 @@ class NewApplicationAction extends OwnerDesignAction
         parent::prepare($args);
 
         if (!common_logged_in()) {
+            // TRANS: Client error displayed trying to add a new application while not logged in.
             $this->clientError(_('You must be logged in to register an application.'));
             return false;
         }
@@ -91,35 +92,38 @@ class NewApplicationAction extends OwnerDesignAction
 
     function handlePost($args)
     {
-    // Workaround for PHP returning empty $_POST and $_FILES when POST
+        // Workaround for PHP returning empty $_POST and $_FILES when POST
         // length > post_max_size in php.ini
 
         if (empty($_FILES)
             && empty($_POST)
             && ($_SERVER['CONTENT_LENGTH'] > 0)
         ) {
-            $msg = _('The server was unable to handle that much POST ' .
-             'data (%s bytes) due to its current configuration.');
+            // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+            // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+            $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                      'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                      intval($_SERVER['CONTENT_LENGTH']));
             $this->clientException(sprintf($msg, $_SERVER['CONTENT_LENGTH']));
             return;
         }
 
-    // CSRF protection
-    $token = $this->trimmed('token');
-    if (!$token || $token != common_session_token()) {
-        $this->clientError(_('There was a problem with your session token.'));
-        return;
-    }
+        // CSRF protection
+        $token = $this->trimmed('token');
+        if (!$token || $token != common_session_token()) {
+            $this->clientError(_('There was a problem with your session token.'));
+            return;
+        }
 
-    $cur = common_current_user();
+        $cur = common_current_user();
 
-    if ($this->arg('cancel')) {
-        common_redirect(common_local_url('oauthappssettings'), 303);
-    } elseif ($this->arg('save')) {
-        $this->trySave();
-    } else {
-        $this->clientError(_('Unexpected form submission.'));
-    }
+        if ($this->arg('cancel')) {
+            common_redirect(common_local_url('oauthappssettings'), 303);
+        } elseif ($this->arg('save')) {
+            $this->trySave();
+        } else {
+            $this->clientError(_('Unexpected form submission.'));
+        }
     }
 
     function showForm($msg=null)
@@ -162,14 +166,18 @@ class NewApplicationAction extends OwnerDesignAction
             $this->showForm(_('Name already in use. Try another one.'));
             return;
         } elseif (mb_strlen($name) > 255) {
-            $this->showForm(_('Name is too long (max 255 chars).'));
+            $this->showForm(_('Name is too long (maximum 255 chars).'));
             return;
         } elseif (empty($description)) {
             $this->showForm(_('Description is required.'));
             return;
         } elseif (Oauth_application::descriptionTooLong($description)) {
             $this->showForm(sprintf(
-                _('Description is too long (max %d chars).'),
+                // TRANS: Form validation error in New application form.
+                // TRANS: %d is the maximum number of characters for the description.
+                _m('Description is too long (maximum %d character).',
+                   'Description is too long (maximum %d characters).',
+                   Oauth_application::maxDesc()),
                 Oauth_application::maxDesc()));
             return;
         } elseif (empty($source_url)) {
@@ -188,7 +196,7 @@ class NewApplicationAction extends OwnerDesignAction
             $this->showForm(_('Organization is required.'));
             return;
         } elseif (mb_strlen($organization) > 255) {
-            $this->showForm(_('Organization is too long (max 255 chars).'));
+            $this->showForm(_('Organization is too long (maximum 255 chars).'));
             return;
         } elseif (empty($homepage)) {
             $this->showForm(_('Organization homepage is required.'));
diff --git a/actions/newgroup.php b/actions/newgroup.php
index 75bc293ec6..ebfe9b599d 100644
--- a/actions/newgroup.php
+++ b/actions/newgroup.php
@@ -139,13 +139,13 @@ class NewgroupAction extends Action
             $this->showForm(_('Homepage is not a valid URL.'));
             return;
         } else if (!is_null($fullname) && mb_strlen($fullname) > 255) {
-            $this->showForm(_('Full name is too long (max 255 chars).'));
+            $this->showForm(_('Full name is too long (maximum 255 characters).'));
             return;
         } else if (User_group::descriptionTooLong($description)) {
             $this->showForm(sprintf(_('description is too long (max %d chars).'), User_group::maxDescription()));
             return;
         } else if (!is_null($location) && mb_strlen($location) > 255) {
-            $this->showForm(_('Location is too long (max 255 chars).'));
+            $this->showForm(_('Location is too long (maximum 255 characters).'));
             return;
         }
 
diff --git a/actions/newmessage.php b/actions/newmessage.php
index 25e58feab3..c58ed3849e 100644
--- a/actions/newmessage.php
+++ b/actions/newmessage.php
@@ -147,8 +147,11 @@ class NewmessageAction extends Action
             $content_shortened = common_shorten_links($this->content);
 
             if (Message::contentTooLong($content_shortened)) {
-                $this->showForm(sprintf(_('That\'s too long. ' .
-                                          'Max message size is %d chars.'),
+                // TRANS: Form validation error displayed when message content is too long.
+                // TRANS: %d is the maximum number of characters for a message.
+                $this->showForm(sprintf(_m('That\'s too long. Maximum message size is %d character.',
+                                           'That\'s too long. Maximum message size is %d characters.',
+                                           Message::maxContent()),
                                         Message::maxContent()));
                 return;
             }
diff --git a/actions/newnotice.php b/actions/newnotice.php
index ea832cf4e1..57cd847c6e 100644
--- a/actions/newnotice.php
+++ b/actions/newnotice.php
@@ -82,7 +82,6 @@ class NewnoticeAction extends Action
      *
      * @return void
      */
-
     function handle($args)
     {
         if (!common_logged_in()) {
@@ -91,9 +90,12 @@ class NewnoticeAction extends Action
             // check for this before token since all POST and FILES data
             // is losts when size is exceeded
             if (empty($_POST) && $_SERVER['CONTENT_LENGTH']) {
-                $this->clientError(sprintf(_('The server was unable to handle ' .
-                                             'that much POST data (%s bytes) due to its current configuration.'),
-                                           $_SERVER['CONTENT_LENGTH']));
+                // TRANS: Client error displayed when the number of bytes in a POST request exceeds a limit.
+                // TRANS: %s is the number of bytes of the CONTENT_LENGTH.
+                $msg = _m('The server was unable to handle that much POST data (%s byte) due to its current configuration.',
+                          'The server was unable to handle that much POST data (%s bytes) due to its current configuration.',
+                          intval($_SERVER['CONTENT_LENGTH']));
+                $this->clientError(sprintf($msg,$_SERVER['CONTENT_LENGTH']));
             }
             parent::handle($args);
 
@@ -352,4 +354,3 @@ class NewnoticeAction extends Action
         $nli->show();
     }
 }
-
diff --git a/actions/profilesettings.php b/actions/profilesettings.php
index 0c1efa9072..e1a0f8b6d0 100644
--- a/actions/profilesettings.php
+++ b/actions/profilesettings.php
@@ -253,20 +253,20 @@ class ProfilesettingsAction extends AccountSettingsAction
                 return;
             } else if (!is_null($fullname) && mb_strlen($fullname) > 255) {
                 // TRANS: Validation error in form for profile settings.
-                $this->showForm(_('Full name is too long (max 255 characters).'));
+                $this->showForm(_('Full name is too long (maximum 255 characters).'));
                 return;
             } else if (Profile::bioTooLong($bio)) {
                 // TRANS: Validation error in form for profile settings.
                 // TRANS: Plural form is used based on the maximum number of allowed
                 // TRANS: characters for the biography (%d).
-                $this->showForm(sprintf(_m('Bio is too long (max %d character).',
-                                           'Bio is too long (max %d characters).',
+                $this->showForm(sprintf(_m('Bio is too long (maximum %d character).',
+                                           'Bio is too long (maximum %d characters).',
                                            Profile::maxBio()),
                                         Profile::maxBio()));
                 return;
             } else if (!is_null($location) && mb_strlen($location) > 255) {
                 // TRANS: Validation error in form for profile settings.
-                $this->showForm(_('Location is too long (max 255 characters).'));
+                $this->showForm(_('Location is too long (maximum 255 characters).'));
                 return;
             }  else if (is_null($timezone) || !in_array($timezone, DateTimeZone::listIdentifiers())) {
                 // TRANS: Validation error in form for profile settings.
@@ -278,7 +278,7 @@ class ProfilesettingsAction extends AccountSettingsAction
                 return;
             } else if (!is_null($language) && strlen($language) > 50) {
                 // TRANS: Validation error in form for profile settings.
-                $this->showForm(_('Language is too long (max 50 characters).'));
+                $this->showForm(_('Language is too long (maximum 50 characters).'));
                 return;
             }
 
diff --git a/actions/register.php b/actions/register.php
index 7307bc689b..3ae3f56f60 100644
--- a/actions/register.php
+++ b/actions/register.php
@@ -224,14 +224,16 @@ class RegisterAction extends Action
                 $this->showForm(_('Homepage is not a valid URL.'));
                 return;
             } else if (!is_null($fullname) && mb_strlen($fullname) > 255) {
-                $this->showForm(_('Full name is too long (max 255 chars).'));
+                $this->showForm(_('Full name is too long (maximum 255 characters).'));
                 return;
             } else if (Profile::bioTooLong($bio)) {
-                $this->showForm(sprintf(_('Bio is too long (max %d chars).'),
+                $this->showForm(sprintf(_m('Bio is too long (maximum %d character).',
+                                           'Bio is too long (maximum %d characters).',
+                                           Profile::maxBio()),
                                         Profile::maxBio()));
                 return;
             } else if (!is_null($location) && mb_strlen($location) > 255) {
-                $this->showForm(_('Location is too long (max 255 chars).'));
+                $this->showForm(_('Location is too long (maximum 255 characters).'));
                 return;
             } else if (strlen($password) < 6) {
                 $this->showForm(_('Password must be 6 or more characters.'));
@@ -465,7 +467,12 @@ class RegisterAction extends Action
             $this->elementStart('li');
             $maxBio = Profile::maxBio();
             if ($maxBio > 0) {
-                $bioInstr = sprintf(_('Describe yourself and your interests in %d chars'),
+                // TRANS: Tooltip for field label in form for profile settings. Plural
+                // TRANS: is decided by the number of characters available for the
+                // TRANS: biography (%d).
+                $bioInstr = sprintf(_m('Describe yourself and your interests in %d character',
+                                       'Describe yourself and your interests in %d characters',
+                                       $maxBio),
                                     $maxBio);
             } else {
                 $bioInstr = _('Describe yourself and your interests');