title: django submit two different forms with one submit button
body: <p>is it possible to submit two different forms, with one submit button in django?
  i have one form called "instrument" and 4 equal forms "config". now i'd like to submit always one config and instrument. e.g. instrument + config 1, and instrument + config 2. and every config have its own submit button. </p>
  
  <p>i have tried it with one button in the config form: </p>
  
  <pre><code>&lt;input onclick="submitForms()" class="btn btn-primary cfg" type="submit" value="Start" &gt;
  </code></pre>
  
  <p>and call a js function 'onclick': </p>
  
  <pre><code>submitForms = function(){
      console.log('ok'); //only for testing
      document.forms["firstForm"].submit();
      document.forms["secondForm"].submit();
  }
  </code></pre>
  
  <p>this is my method in the views.py:</p>
  
  <pre><code>if request.method == 'POST':
          form1 = dataproviderInstrumentForm(request.POST)
          form2 = dynamicTimeseriesForm(request.POST)
          print(request.POST)
          if form1.is_valid() or form2.is_valid(): 
              # do some stuff
  
  else:
      form1 = dataproviderInstrumentForm() # an unbound form
      form2 = dynamicTimeseriesForm() # an unbound form
  </code></pre>