When you configure a field for the ticket form and you are in the settings tab, you will see that this label is missing:

I guess this has something to do with the file dynamic-field-config.tmpl.php in include/staff/templates.
Line 102 seems to be the source of the problem:
<div class="span4">
<div style="margin-bottom:5px"><strong><?php __('Data Integrity');
?></strong>
<i class="help-tip icon-question-sign"
data-title="<?php echo __('Required to close a thread'); ?>"
data-content="<?php echo __('Optionally, this field can prevent closing a thread until it has valid data.'); ?>"></i>
</div>
</div>
This is the corresponding part for the Editable-Label to compare:
<div class="span4">
<div style="margin-bottom:5px"><strong>Editable</strong>
<i class="help-tip icon-question-sign"
data-content="<?php echo __('Fields marked editable allow agents and endusers to update the content of this field after the form entry has been created.'); ?>"
data-title="<?php echo __('Editable'); ?>"></i>
</div>
</div>
Normally the Label is between the strong tags, in this line there is no label, only this code "" .
By the way: I'm very excited because of the new releases from osticket.com: 1.10 RC3 and 1.9.14. 馃憤
Thank you very much @greezybacon @protich !
Adding "echo" in line 102:
<div style="margin-bottom:5px"><strong><?php echo __('Data Integrity');
..seems to solving the problem:

@mfelber thanks for the hint. I fixed the issue directly
Thanks
Most helpful comment
Adding "echo" in line 102:
<div style="margin-bottom:5px"><strong><?php echo __('Data Integrity');..seems to solving the problem: