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If you want to change the label of a field in jira, you can do so by writing a simple script, and adding it to the description of the field. The below example makes the field colored red.
<script type="text/javascript"> jQuery(document).ready(function($) { JIRA.bind(JIRA.Events.NEW_CONTENT_ADDED, function (e,context) { callFunction(); }); callFunction(); function callFunction(){ AJS.$('label[for=customfield_11700]').css({color:'red'}); AJS.$("#customfield_11700").parent('label').css('color','red'); } }); </script>