Fix image for Flattr button

Closes: #337

html/typo3conf/ext/ter_fe2/Resources/Private/Partials/ExtensionSingleInfo.html

@@ -107,7 +107,7 @@
         </dt>
         <dd>
             <f:link.external uri="{flattrUrl}" target="_blank"><img
-                src="https://api.flattr.com/button/flattr-badge-large.png"
+                src="https://button.flattr.com/flattr-badge-large.png"
                 alt="{f:translate(key:'donate')}" /></f:link.external>
         </dd>
     </f:if>