Plugin rest resources can not resolve text messages using I18nHelper

Problem happens with JIRA 6.3, it's already in production for OnDemand.

Using JiraAuthenticationContext.getI18nHelper().getText() for plugin messages is broken - plugin messages are not resolved since JIRA 6.3.

See https://timesheet-report-release.jira-dev.com/secure/Dashboard.jspa for example and screen shot attached for visible problem.

Is it something that can be fixed in plugin?

Note, atlassian-plugin.xml has the following:
<resource type="i18n" name="i18n-timesheet" location="com.fdu.jira.plugin.portlet.timesheet.timesheet_portlet" />

to load corresponding messages, and it used to work for plugin in all cases, Velocity templates, WebWork actions and REST resources. Now, all cases beside REST resources still work fine.

Thank you.

Thank you.