diff --git a/module/backup/lang/en.php b/module/backup/lang/en.php
index 67e71a4aa5..adf9ec2f5b 100644
--- a/module/backup/lang/en.php
+++ b/module/backup/lang/en.php
@@ -3,7 +3,7 @@ $lang->backup->common      = 'Backup';
 $lang->backup->index       = 'Home';
 $lang->backup->history     = 'History';
 $lang->backup->delete      = 'Delete';
-$lang->backup->backup      = 'Start backup';
+$lang->backup->backup      = 'Start';
 $lang->backup->restore     = 'Restore';
 $lang->backup->change      = 'Modify expiration';
 $lang->backup->changeAB    = 'Modify';
@@ -15,28 +15,28 @@ $lang->backup->size  = 'Size';
 
 $lang->backup->setting    = 'Setting';
 $lang->backup->settingDir = 'Backup Directory';
-$lang->backup->settingList['nofile'] = 'Not backup file and code.';
+$lang->backup->settingList['nofile'] = 'No backup file and code.';
 $lang->backup->settingList['nozip']  = 'Only copy file, Uncompressed';
 $lang->backup->settingList['nosafe'] = 'No need to prevent downloading PHP file header.';
 
 $lang->backup->waitting       = '<span id="backupType"></span> In Progress. Please wait...';
-$lang->backup->progressSQL    = '<p>SQL backup, %s has been backed up.</p>';
-$lang->backup->progressAttach = '<p>SQL backup completed.</p><p>Attachment backup, %s has been backed up.</p>';
-$lang->backup->progressCode   = '<p>SQL backup completed.</p><p>Attachment backup completed.</p><p>Code backup, %s has been backed up.</p>';
+$lang->backup->progressSQL    = '<p>SQL backup, %s is backed up.</p>';
+$lang->backup->progressAttach = '<p>SQL backup completed.</p><p>Attachment backup, %s is backed up.</p>';
+$lang->backup->progressCode   = '<p>SQL backup completed.</p><p>Attachment backup completed.</p><p>Code backup, %s isbacked up.</p>';
 $lang->backup->confirmDelete  = 'Do you want to delete the backup?';
 $lang->backup->confirmRestore = 'Do you want to restore the backup?';
-$lang->backup->holdDays       = 'Reserve last %s days of backups';
-$lang->backup->restoreTip     = 'Only files and databases can be restored when you click Restore. Code can be restored manually.';
+$lang->backup->holdDays       = 'Reserve last %s days of backup';
+$lang->backup->restoreTip     = 'Only files and databases can be restored by clicking Restore. Code can be restored manually.';
 
 $lang->backup->success = new stdclass();
 $lang->backup->success->backup  = 'Done!';
 $lang->backup->success->restore = 'Restored!';
 
 $lang->backup->error = new stdclass();
-$lang->backup->error->noCreateDir = 'Directory is not exists, and can not create it';
-$lang->backup->error->noWritable  = "<code>%s</code> is not writable! Please check the privilege, or backup cannot be done.";
+$lang->backup->error->noCreateDir = 'Directory does not exist, and cannot be created';
+$lang->backup->error->noWritable  = "<code>%s</code> is not writable! Please check the privilege, or backup will not be done.";
 $lang->backup->error->noDelete    = "%s cannot be deleted. Please modify the privilege or manually delete it.";
-$lang->backup->error->restoreSQL  = "Database library restoration failed. Error %s.";
+$lang->backup->error->restoreSQL  = "Restoring database library failed. Error %s.";
 $lang->backup->error->restoreFile = "File restoration failed. Error %s.";
 $lang->backup->error->backupFile  = "File backup failed. Error %s.";
 $lang->backup->error->backupCode  = "Code backup failed. Error %s.";
diff --git a/module/convert/lang/en.php b/module/convert/lang/en.php
index 431a08e25e..35d4d1fedb 100644
--- a/module/convert/lang/en.php
+++ b/module/convert/lang/en.php
@@ -48,9 +48,9 @@ $lang->convert->fail        = '<span class="text-danger"><i class="icon-remove-s
 
 $lang->convert->dbHost      = 'Database Server';
 $lang->convert->dbPort      = 'Server Port';
-$lang->convert->dbUser      = 'Databse User Name';
+$lang->convert->dbUser      = 'Database User Name';
 $lang->convert->dbPassword  = 'Database Password';
-$lang->convert->dbName      = 'Databse used in %s';
+$lang->convert->dbName      = 'Database used in %s';
 $lang->convert->dbCharset   = '%s Database Code';
 $lang->convert->dbPrefix    = '%s Table Prefix';
 $lang->convert->installPath = '%s Installed path';
@@ -97,7 +97,7 @@ $lang->convert->errorBuildExists   = 'Build %s existed.';
 $lang->convert->errorReleaseExists = 'Release %s existed.';
 $lang->convert->errorCopyFailed    = 'File %s copy failed.';
 
-$lang->convert->setParam = 'Please set parameters.';
+$lang->convert->setParam = 'Set parameters.';
 
 $lang->convert->statusType = new stdclass();
 $lang->convert->priType    = new stdclass();
diff --git a/module/dev/lang/en.php b/module/dev/lang/en.php
index fb8de70908..30be77b9c6 100644
--- a/module/dev/lang/en.php
+++ b/module/dev/lang/en.php
@@ -9,12 +9,12 @@ $lang->dev->params     = 'Parameters';
 $lang->dev->type       = 'Type';
 $lang->dev->desc       = 'Description';
 $lang->dev->noParams   = 'No Parameters';
-$lang->dev->post       = 'POST Parameters';
+$lang->dev->post       = 'POST Parameter';
 
 $lang->dev->paramRange  = 'Parameter Range: %s';
 $lang->dev->paramDate   = 'Date format: YY-mm-dd. such as 2019-01-01';
 $lang->dev->paramColor  = 'Color format: #RGB. such as #3da7f5';
-$lang->dev->paramMailto = "Use account. Separate accounts by ','.";
+$lang->dev->paramMailto = "User account. Separate accounts by ','.";
 
 $lang->dev->fields = array();
 $lang->dev->fields['id']     = 'ID';
diff --git a/module/editor/lang/en.php b/module/editor/lang/en.php
index d8bb227313..e54c0f77fd 100644
--- a/module/editor/lang/en.php
+++ b/module/editor/lang/en.php
@@ -15,11 +15,11 @@ $lang->editor->edit      = 'Edit Extension';
 $lang->editor->save      = 'Save Page';
 $lang->editor->delete    = 'Delete Page';
 
-$lang->editor->moduleList   = 'Modules';
+$lang->editor->moduleList   = 'Module';
 $lang->editor->filePath     = "Extension:";
 $lang->editor->sourceFile   = 'Source File:';
 $lang->editor->fileName     = "File Name:";
-$lang->editor->isOverride   = "Overrode Duplicated File";
+$lang->editor->isOverride   = "Overridden Duplicated File";
 $lang->editor->exampleHook  = "(e.g. ***.html.hook.php)";
 $lang->editor->exampleJs    = "(e.g. ***.js)";
 $lang->editor->exampleCss   = "(e.g. ***.css)";
@@ -34,7 +34,7 @@ $lang->editor->noticeOkFile  = 'For security reasons, your Admin account has to
 $lang->editor->editFileError = 'You can only modify Zentao files!';
 
 $lang->editor->notWritable   = "Not wirtable. Privilege is required. Please try chmod 777 -R ";
-$lang->editor->notDelete     = 'Cannot be deleted. Please check your permission!';
+$lang->editor->notDelete     = 'Cannot be deleted. Please check your privilege!';
 $lang->editor->emptyFileName = 'Please enter a File Name!';
 
 $lang->editor->translate['config.php']  = 'config';
@@ -46,12 +46,12 @@ $lang->editor->modules['admin']       = 'Admin';
 $lang->editor->modules['api']         = 'API';
 $lang->editor->modules['bug']         = 'Bug';
 $lang->editor->modules['build']       = 'Build';
-$lang->editor->modules['common']      = 'Common Modules';
+$lang->editor->modules['common']      = 'Common Module';
 $lang->editor->modules['company']     = 'Company';
 $lang->editor->modules['convert']     = 'Convert';
 $lang->editor->modules['dept']        = 'Department';
 $lang->editor->modules['doc']         = 'Doc';
-$lang->editor->modules['extension']   = 'Extensiona';
+$lang->editor->modules['extension']   = 'Extension';
 $lang->editor->modules['file']        = 'File';
 $lang->editor->modules['group']       = 'Group';
 $lang->editor->modules['index']       = 'Homepage';
diff --git a/module/mail/lang/en.php b/module/mail/lang/en.php
index f3b21fe80b..fcb634fcb7 100755
--- a/module/mail/lang/en.php
+++ b/module/mail/lang/en.php
@@ -4,20 +4,20 @@ $lang->mail->index         = 'Home';
 $lang->mail->detect        = 'Testing';
 $lang->mail->edit          = 'Edit Settings';
 $lang->mail->save          = 'Save';
-$lang->mail->test          = 'Sending Test';
+$lang->mail->test          = 'Email Sending Test';
 $lang->mail->reset         = 'Reset';
 $lang->mail->resend        = 'Resend';
 $lang->mail->browse        = 'Email List';
 $lang->mail->delete        = 'Delete Email';
 $lang->mail->ztCloud       = 'ZenTao CloudMail';
-$lang->mail->gmail         = 'GMAIL';
+$lang->mail->gmail         = 'Gmail';
 $lang->mail->sendCloud     = 'Notice SendCloud';
 $lang->mail->batchDelete   = 'Batch Delete';
 $lang->mail->sendcloudUser = 'Sync Contact';
 $lang->mail->agreeLicense  = 'Yes';
 $lang->mail->disagree      = 'No';
 
-$lang->mail->turnon      = 'EMail Notification';
+$lang->mail->turnon      = 'Email Notification';
 $lang->mail->async       = 'Async Sending';
 $lang->mail->fromAddress = 'Sender Email';
 $lang->mail->fromName    = 'Sender';
@@ -42,7 +42,7 @@ $lang->mail->unsyncUser = 'Not Synchronized';
 $lang->mail->sync       = 'Synchronize';
 $lang->mail->remove     = 'Remove';
 
-$lang->mail->toList      = 'Recipient';
+$lang->mail->toList      = 'Receiver';
 $lang->mail->ccList      = 'Copy to';
 $lang->mail->subject     = 'Subject';
 $lang->mail->createdBy   = 'Sender';
diff --git a/module/product/lang/en.php b/module/product/lang/en.php
index 86b99cfb6b..198c352493 100644
--- a/module/product/lang/en.php
+++ b/module/product/lang/en.php
@@ -21,7 +21,7 @@ $lang->product->delete      = "Delete {$lang->productCommon}";
 $lang->product->deleted     = 'Deleted';
 $lang->product->close       = 'Close';
 $lang->product->select      = "Select {$lang->productCommon}";
-$lang->product->mine        = 'Mine:';
+$lang->product->mine        = 'My:';
 $lang->product->other       = 'Other:';
 $lang->product->closed      = 'Closed';
 $lang->product->updateOrder = 'Order';
@@ -76,8 +76,8 @@ $lang->product->allRelease    = 'All Release';
 $lang->product->maintain      = 'Maintaining';
 $lang->product->latestDynamic = 'Dynamic';
 $lang->product->plan          = 'Plan';
-$lang->product->iteration     = 'Version Iteration';
-$lang->product->iterationInfo = '%s Iterations';
+$lang->product->iteration     = 'Build Iteration';
+$lang->product->iterationInfo = '%s Iteration';
 $lang->product->iterationView = 'Details';
 
 $lang->product->searchStory  = 'Search';
diff --git a/module/project/lang/en.php b/module/project/lang/en.php
index 4b08b69411..b50ef21c89 100644
--- a/module/project/lang/en.php
+++ b/module/project/lang/en.php
@@ -50,7 +50,7 @@ $lang->project->all           = 'All';
 $lang->project->undone        = 'Unfinished';
 $lang->project->unclosed      = 'Unclosed';
 $lang->project->typeDesc      = 'No story, bug, build, test or burndown is allowed in OPS';
-$lang->project->mine          = 'Mine: ';
+$lang->project->mine          = 'My: ';
 $lang->project->other         = 'Other:';
 $lang->project->deleted       = 'Deleted';
 $lang->project->delayed       = 'Delayed';
@@ -166,9 +166,9 @@ $lang->project->statusSelects['doing']        = 'Doing';
 $lang->project->statusSelects['finishedbyme'] = 'FinishedbyMe';
 $lang->project->statusSelects['done']         = 'Done';
 $lang->project->statusSelects['closed']       = 'Closed';
-$lang->project->statusSelects['cancel']       = 'Canceled';
+$lang->project->statusSelects['cancel']    :   = 'Canceled';
 
-$lang->project->groups['']           = 'Groups';
+$lang->project->groups['']           = 'Group';
 $lang->project->groups['story']      = 'By Story';
 $lang->project->groups['status']     = 'By Status';
 $lang->project->groups['pri']        = 'By Priority';
@@ -178,7 +178,7 @@ $lang->project->groups['closedBy']   = 'By ClosedBy';
 $lang->project->groups['type']       = 'By Type';
 
 $lang->project->groupFilter['story']['all']         = $lang->project->all;
-$lang->project->groupFilter['story']['linked']      = 'Task Linked to Story';
+$lang->project->groupFilter['story']['linked']      = 'LinkedtoStory Task';
 $lang->project->groupFilter['pri']['all']           = $lang->project->all;
 $lang->project->groupFilter['pri']['noset']         = 'Not set';
 $lang->project->groupFilter['assignedTo']['undone'] = 'Unfinished';
diff --git a/module/report/lang/en.php b/module/report/lang/en.php
index e2432d8dbe..dcb64d5f69 100644
--- a/module/report/lang/en.php
+++ b/module/report/lang/en.php
@@ -66,12 +66,12 @@ $lang->report->deviation     = 'Deviation';
 $lang->report->deviationRate = 'Deviation Rate';
 $lang->report->total         = 'Total';
 $lang->report->to            = 'to';
-$lang->report->taskTotal     = "Total Tasks";
-$lang->report->manhourTotal  = "Total Hours";
+$lang->report->taskTotal     = "Total Task";
+$lang->report->manhourTotal  = "Total Hour";
 $lang->report->validRate     = "Valid Rate";
 $lang->report->validRateTips = "Solution is fixed/postponed or status is resolved/closed.";
 $lang->report->unplanned     = 'Unplanned';
-$lang->report->workday       = 'Hours/Day';
+$lang->report->workday       = 'Hour/Day';
 $lang->report->diffDays      = 'Man-Day';
 
 $lang->report->typeList['default'] = 'Default';
diff --git a/module/task/lang/en.php b/module/task/lang/en.php
index 27e99a8318..9aa5734b47 100644
--- a/module/task/lang/en.php
+++ b/module/task/lang/en.php
@@ -65,11 +65,11 @@ $lang->task->hour              = 'Hour';
 $lang->task->consumedThisTime  = 'Cost';
 $lang->task->leftThisTime      = 'Left';
 $lang->task->datePlan          = 'Plan';
-$lang->task->estStarted        = 'Plan Start';
+$lang->task->estStarted        = 'Planne Start';
 $lang->task->realStarted       = 'Actual Start';
 $lang->task->date              = 'Date';
-$lang->task->deadline          = 'Plan End';
-$lang->task->deadlineAB        = 'Plan End';
+$lang->task->deadline          = 'Planned End';
+$lang->task->deadlineAB        = 'Planned End';
 $lang->task->status            = 'Status';
 $lang->task->desc              = 'Description';
 $lang->task->assign            = 'Assign';
@@ -81,8 +81,8 @@ $lang->task->assignedDate      = 'Assigned';
 $lang->task->openedBy          = 'Created by';
 $lang->task->openedDate        = 'Created';
 $lang->task->openedDateAB      = 'Add';
-$lang->task->finishedBy        = 'End By';
-$lang->task->finishedByAB      = 'End By';
+$lang->task->finishedBy        = 'Ended By';
+$lang->task->finishedByAB      = 'Ended By';
 $lang->task->finishedDate      = 'Actual End';
 $lang->task->finishedDateAB    = 'Actual End';
 $lang->task->finishedList      = 'FinishedBy list';
@@ -100,7 +100,7 @@ $lang->task->deleteEstimate    = 'Delete Est.';
 $lang->task->colorTag          = 'Color Tag';
 $lang->task->files             = 'Files';
 $lang->task->hasConsumed       = 'Cost';
-$lang->task->multiple          = 'Multiple Tasks';
+$lang->task->multiple          = 'Multiple Task';
 $lang->task->multipleAB        = ' Multiple';
 $lang->task->team              = 'Team';
 $lang->task->transfer          = 'Transfer';
@@ -152,7 +152,7 @@ $lang->task->reasonList['']       = '';
 $lang->task->reasonList['done']   = 'Done';
 $lang->task->reasonList['cancel'] = 'Cancelled';
 
-$lang->task->afterChoices['continueAdding'] = ' Continue adding Tasks';
+$lang->task->afterChoices['continueAdding'] = ' Continue Add Task';
 $lang->task->afterChoices['toTaskList']     = 'Back to Task List';
 $lang->task->afterChoices['toStoryList']    = 'Back to Story List';
 
diff --git a/module/testcase/lang/en.php b/module/testcase/lang/en.php
index 6ee464e765..b1ac6ac051 100644
--- a/module/testcase/lang/en.php
+++ b/module/testcase/lang/en.php
@@ -86,15 +86,15 @@ $lang->testcase->batchReview             = "Batch Review";
 $lang->testcase->edit                    = "Edit";
 $lang->testcase->batchEdit               = "Batch Edit ";
 $lang->testcase->batchChangeModule       = "Batch Change Module";
-$lang->testcase->confirmLibcaseChange    = "Confirm Library Case Change";
-$lang->testcase->ignoreLibcaseChange     = "Ignore Library Case Change";
+$lang->testcase->confirmLibcaseChange    = "Confirm CaseLib Change";
+$lang->testcase->ignoreLibcaseChange     = "Ignore CaseLib Change";
 $lang->testcase->batchChangeBranch       = "Batch Change Branch";
 $lang->testcase->groupByStories          = 'Group by Story';
 $lang->testcase->delete                  = "Delete";
 $lang->testcase->batchDelete             = "Batch Delete ";
 $lang->testcase->batchConfirmStoryChange = "Batch Confirm";
 $lang->testcase->batchCaseTypeChange     = "Batch Change Type";
-$lang->testcase->browse                  = "Cases";
+$lang->testcase->browse                  = "Case";
 $lang->testcase->groupCase               = "By Group";
 $lang->testcase->import                  = "Import";
 $lang->testcase->importFile              = "Import CSV";
@@ -114,7 +114,7 @@ $lang->testcase->viewAll                 = 'All';
 
 $lang->testcase->new = 'New';
 
-$lang->testcase->num = 'Cases:';
+$lang->testcase->num = 'Case:';
 
 $lang->testcase->deleteStep   = 'Delete';
 $lang->testcase->insertBefore = 'Inserted Before';
@@ -123,7 +123,7 @@ $lang->testcase->insertAfter  = 'Inserted After';
 $lang->testcase->assignToMe   = 'Assigned To Me';
 $lang->testcase->openedByMe   = 'Created By Me';
 $lang->testcase->allCases     = 'All';
-$lang->testcase->allTestcases = 'All Cases';
+$lang->testcase->allTestcases = 'All Case';
 $lang->testcase->needConfirm  = 'Story Changed';
 $lang->testcase->bySearch     = 'Search';
 $lang->testcase->unexecuted   = 'Wait';
@@ -138,9 +138,9 @@ $lang->testcase->legendBasicInfo    = 'Basic Info';
 $lang->testcase->legendAttatch      = 'File';
 $lang->testcase->legendLinkBugs     = 'Bug';
 $lang->testcase->legendOpenAndEdit  = 'Create/Edit';
-$lang->testcase->legendComment      = 'Remark';
+$lang->testcase->legendComment      = 'Comment';
 
-$lang->testcase->summary            = "Cases on this page : <strong>%s</strong> Total, <strong>%s</strong> runed.";
+$lang->testcase->summary            = "Case on this page : <strong>%s</strong> Total, <strong>%s</strong> runed.";
 $lang->testcase->confirmDelete      = 'Do you want to delete this Test Case?';
 $lang->testcase->confirmBatchDelete = 'Do you want to batch delete these Test Cases?';
 $lang->testcase->ditto              = 'Ditto';
diff --git a/module/testtask/lang/en.php b/module/testtask/lang/en.php
index 784a8a3aab..553911adc1 100644
--- a/module/testtask/lang/en.php
+++ b/module/testtask/lang/en.php
@@ -17,7 +17,7 @@ $lang->testtask->view             = "Overview";
 $lang->testtask->edit             = "Edit";
 $lang->testtask->browse           = "Test";
 $lang->testtask->linkCase         = "Link Case";
-$lang->testtask->selectVersion    = "Select Version";
+$lang->testtask->selectVersion    = "Select Build";
 $lang->testtask->unlinkCase       = "Unlink";
 $lang->testtask->batchUnlinkCases = "Batch unlink case";
 $lang->testtask->batchAssign      = "Batch assign";
@@ -58,7 +58,7 @@ $lang->testtask->desc           = 'Description';
 $lang->testtask->mailto         = 'Mailto';
 $lang->testtask->status         = 'Status';
 $lang->testtask->assignedTo     = 'Assigned';
-$lang->testtask->linkVersion    = 'Version';
+$lang->testtask->linkVersion    = 'Build';
 $lang->testtask->lastRunAccount = 'Run By';
 $lang->testtask->lastRunTime    = 'Last Run';
 $lang->testtask->lastRunResult  = 'Result';
diff --git a/module/todo/lang/en.php b/module/todo/lang/en.php
index 474fc34fec..860d77de42 100644
--- a/module/todo/lang/en.php
+++ b/module/todo/lang/en.php
@@ -12,7 +12,7 @@
 $lang->todo->common       = 'Todo';
 $lang->todo->index        = "Home";
 $lang->todo->create       = "Add Todo";
-$lang->todo->createCycle  = "Add Recur Todo";
+$lang->todo->createCycle  = "Add Recurred Todo";
 $lang->todo->assignTo     = "Assign";
 $lang->todo->activate     = "Activate";
 $lang->todo->batchCreate  = "Batch Add";
@@ -31,9 +31,9 @@ $lang->todo->legendBasic  = "Basic Info";
 $lang->todo->cycle        = "Recurrence";
 $lang->todo->cycleConfig  = "Set Recurrence";
 
-$lang->todo->reasonList['story'] = "Transfer Story";
-$lang->todo->reasonList['task']  = "Transfer Task";
-$lang->todo->reasonList['bug']   = "Transfer Bug";
+$lang->todo->reasonList['story'] = "Convert to Story";
+$lang->todo->reasonList['task']  = "Convert to Task";
+$lang->todo->reasonList['bug']   = "Convert to Bug";
 $lang->todo->reasonList['done']  = "Done";
 
 $lang->todo->id          = 'ID';
@@ -60,9 +60,9 @@ $lang->todo->every      = 'Every';
 $lang->todo->beforeDays = "%s<span class='input-group-addon'>early in advance to be done</span>";
 $lang->todo->dayNames   = array(1 => 'Monday', 2 => 'Tuesday', 3 => 'Wednesday', 4 => 'Thursday', 5 => 'Friday', 6 => 'Saturday', 0 => 'Sunday');
 
-$lang->todo->confirmBug   = 'This Todo is related to Bug #%s. Do you want to edit it?';
-$lang->todo->confirmTask  = 'This Todo is related to Task #%s，Do you want to edit it?';
-$lang->todo->confirmStory = 'This Todo is related to Story #%s，Do you want to edit it?';
+$lang->todo->confirmBug   = 'This Todo is linked to Bug #%s. Do you want to edit it?';
+$lang->todo->confirmTask  = 'This Todo is linked to Task #%s，Do you want to edit it?';
+$lang->todo->confirmStory = 'This Todo is linked to Story #%s，Do you want to edit it?';
 
 $lang->todo->statusList['wait']   = 'Wait';
 $lang->todo->statusList['doing']  = 'Doing';
@@ -91,10 +91,10 @@ if($config->global->flow == 'onlyTask' or $config->global->flow == 'onlyStory')
 $lang->todo->confirmDelete  = "Do you want to delete this Todo?";
 $lang->todo->thisIsPrivate  = 'This is a private Todo';
 $lang->todo->lblDisableDate = 'Set it later';
-$lang->todo->lblBeforeDays  = "Create a todo %s days(s) earlier";
-$lang->todo->lblClickCreate = "Click to add a todo";
+$lang->todo->lblBeforeDays  = "Create a todo %s day(s) earlier";
+$lang->todo->lblClickCreate = "Click to Add Todo";
 $lang->todo->noTodo         = 'No todos of this type.';
-$lang->todo->noAssignedTo   = "The AssignedTo should not be empty.";
+$lang->todo->noAssignedTo   = "The AssignTo should not be empty.";
 
 $lang->todo->periods['all']        = 'All';
 $lang->todo->periods['thisYear']   = 'ThisYear';