PFB the JSP code,
<fmt:message var="applyText" key="checkout.order.summary.coupon.apply" />
<dsp:input iclass="btn green rev validatePromoCode" id="atg_store_applyCoupon" bean="CouponFormHandler.claimCoupon" type="submit" value="${applyText}" />
submit button value is coming from property file, PFB,
checkout.order.summary.coupon.apply = Einlösen
Button value text is not encoded in UI, Expected value for the button should be Einlösen
Thanks
Use dsp:tagAttribute:
<fmt:message var="applyText" key="checkout.order.summary.coupon.apply" />
<dsp:input iclass="btn green rev validatePromoCode" id="atg_store_applyCoupon" bean="CouponFormHandler.claimCoupon" type="submit">
<dsp:tagAttribute name="value" value="${applyText}"/>
</dsp:input>