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I get this error while trying to put this default value in string parameter :

<osm-script output="json" timeout="25">
  <!-- gather results -->
  <union>
    <!-- query part for: “shop=supermarket” -->
    <query type="node">
      <has-kv k="shop" v="supermarket"/>
      <bbox-query {{bbox}}/>
    </query>
    <query type="way">
      <has-kv k="shop" v="supermarket"/>
      <bbox-query {{bbox}}/>
    </query>
    <query type="relation">
      <has-kv k="shop" v="supermarket"/>
      <bbox-query {{bbox}}/>
    </query>
  </union>
  <!-- print results -->
  <print mode="body"/>
  <recurse type="down"/>
  <print mode="skeleton" order="quadtile"/>
</osm-script>

Traceback (most recent call last):
  File "/home/etienne/.qgis2/python/plugins/processing/modeler/ModelerParameterDefinitionDialog.py", line 327, in okPressed
    str(self.defaultTextBox.text()))
UnicodeEncodeError: 'ascii' codec can't encode character u'\\u201c' in position 84: ordinal not in range(128)