Update TwoStateWidget to use a template

Make it compatible with the SourceColumn class.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/html_widgets.py

@@ -0,0 +1,22 @@
+from __future__ import unicode_literals
+
+from django.template.loader import render_to_string
+
+from .icons import icon_fail as default_icon_fail
+from .icons import icon_ok as default_icon_ok
+
+
+class TwoStateWidget(object):
+    template_name = 'common/two_state_widget.html'
+
+    def __init__(self, center=False, icon_ok=None, icon_fail=None):
+        self.icon_ok = icon_ok or default_icon_ok
+        self.icon_fail = icon_fail or default_icon_fail
+
+    def render(self, name=None, value=None):
+        return render_to_string(
+            template_name=self.template_name, context={
+                'icon_ok': self.icon_ok, 'icon_fail': self.icon_fail,
+                'value': value
+            }
+        )