It uses the translation file to pull the text set so you would change this part of setPointValue.html
from
<button ng-disabled="!point.pointLocator.settable || result.pending" ng-click="result=point.setValueResult(input.value)" ma-tr="common.set"
class="btn btn-default" ng-class="{'set-pending': result.pending, 'set-success': result.success, 'set-error': result.error}"></button>
to
<button ng-disabled="!point.pointLocator.settable || result.pending" ng-click="result=point.setValueResult(input.value)"
class="btn btn-default" ng-class="{'set-pending': result.pending, 'set-success': result.success, 'set-error': result.error}">TEXT</button>