What would have been better is to include this code directly in the tag definition, eg. https://github.com/georchestra/georchestra/blob/master/ldapadmin/src/main/webapp/WEB-INF/tags/textarea.tag for `<t:textarea>`, adding `<jsp:attribute name="placeholder"><s:message code="description.placeholder" /></jsp:attribute>` at https://github.com/georchestra/georchestra/blob/master/ldapadmin/src/main/webapp/WEB-INF/views/createAccountForm.jsp#L71.

I wasn't able to do it, because jQuery is not loaded at this time. Maybe a pure-javascript solution could do the job, but I did not encounter a javascript equivalent to `$(document).ready()` jQuery function.

I'm open to proposals.