Changing the text "add sample to cart"

Use this code where you want sample button and you can also change the text

<form  class="cart sample" method="post" enctype="multipart/form-data">
		<div class="single_variation_wrap" style="display:block !important;">
			<button type="submit"
			class="single_add_to_cart_button button alt single_add_sample_to_cart_button btn btn-default">
			Add Sample Product</button>
			<input type="hidden" name="sample" id="sample" value="true">
			<input type="hidden" name="add-to-cart" id="sample_add_to_cart" value="<?php echo $post->ID ?>">
		</div>
		</form>

This plugin is localized.
You find a .pot file under language folder, you need to create a german language file starting from .pot file.
If you made a german .po file send it to me and I’ll add it to the plugin.
If you are not confident with poedit and file translation may I could help you to make it.