Merge branch 'mail-fix-style' into 'stable-3.1'

Till Brehm

2016-04-13 9301bdae65a51798040a163cff53c46dd1c9f33c

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<tmpl_dyninclude name="content_tpl">
<input type="hidden" name="_csrf_id" value="{tmpl_var name='_csrf_id'}" />
<input type="hidden" name="_csrf_key" value="{tmpl_var name='_csrf_key'}" />