Add automatic label length trimming

app/templates/mobile.html

@@ -46,6 +46,10 @@
             <input id="mobileMargin" type="number" min="0" max="20" step="0.5" value="2">
           </label>
         </div>
+        <label class="check-row">
+          <input id="mobileAutoLength" type="checkbox" checked>
+          Laenge automatisch begrenzen
+        </label>
 
         <div class="grid-2">
           <label>