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It becomes cumbersome to maintain multiple xml files, particularly when all I'm changing is the trash icon classes etc., i.e.

phrase id="DeleteLink" value="Delete" class="glyphicon glyphicon-trash ewIcon"

alternatively you can use Language_Load server event (see help file):

function Language_Load() {
$this->setPhrase("MyID", "MyValue"); // Refer to language file for the actual phrase id
$this->setPhraseClass("MyID", "glyphicon glyphicon-xxx ewIcon"); // Refer to http://getbootstrap.com/components/#glyphicons for icon name
}