--- a/src/pyams_content/component/paragraph/interfaces/__init__.py	Tue Nov 27 15:35:22 2018 +0100
+++ b/src/pyams_content/component/paragraph/interfaces/__init__.py	Tue Nov 27 15:35:58 2018 +0100
@@ -12,21 +12,18 @@
 
 __docformat__ = 'restructuredtext'
 
-
-# import standard library
-
 from zope.annotation.interfaces import IAttributeAnnotatable
 from zope.container.constraints import containers, contains
 from zope.container.interfaces import IOrderedContainer
 from zope.contentprovider.interfaces import IContentProvider
-from zope.interface import Interface, Attribute
-from zope.schema import Bool, List, Choice, Set
+from zope.interface import Attribute, Interface
+from zope.schema import Bool, Choice, List, Set
+
+from pyams_content.features.renderer import IRenderedContent
+from pyams_i18n.schema import I18nTextLineField
 
 from pyams_content import _
-# import interfaces
-from pyams_content.features.renderer import IRenderedContent
-# import packages
-from pyams_i18n.schema import I18nTextLineField
+
 
 PARAGRAPH_CONTAINER_KEY = 'pyams_content.paragraph'
 
@@ -56,6 +53,10 @@
 PARAGRAPH_HIDDEN_FIELDS = ('__parent__', '__name__', 'visible', 'anchor')
 
 
+class IParagraphTitle(Interface):
+    """Paragraph title adapter"""
+
+
 class IParagraphContainer(IOrderedContainer):
     """Paragraphs container"""
 
@@ -68,6 +69,9 @@
         """Get visible paragraphs matching given arguments"""
 
 
+CONTENT_PARAGRAPHS_VOCABULARY = 'PyAMS content paragraphs'
+
+
 class IParagraphContainerTarget(IAttributeAnnotatable):
     """Paragraphs container marker interface"""
 
@@ -92,7 +96,7 @@
     allowed_paragraphs = Set(title=_("Allowed paragraphs"),
                              description=_("List of paragraphs allowed for this content type"),
                              required=False,
-                             value_type=Choice(vocabulary='PyAMS paragraph factories'))
+                             value_type=Choice(vocabulary=PARAGRAPH_FACTORIES_VOCABULARY))
 
     auto_created_paragraphs = List(title=_("Default paragraphs"),
                                    description=_("List of paragraphs automatically added to a new content"),

--- a/src/pyams_content/component/paragraph/interfaces/milestone.py	Tue Nov 27 15:35:22 2018 +0100
+++ b/src/pyams_content/component/paragraph/interfaces/milestone.py	Tue Nov 27 15:35:58 2018 +0100
@@ -17,7 +17,7 @@
 from zope.interface import Attribute, Interface
 from zope.schema import Bool, Choice
 
-from pyams_content.component.paragraph import IBaseParagraph
+from pyams_content.component.paragraph import CONTENT_PARAGRAPHS_VOCABULARY, IBaseParagraph
 from pyams_content.interfaces.container import IOrderedContainer
 from pyams_i18n.schema import I18nTextField, I18nTextLineField
 
@@ -47,7 +47,7 @@
 
     anchor = Choice(title=_("Anchor"),
                     description=_("Paragraph to which this milestone should lead"),
-                    vocabulary='PyAMS content paragraphs',
+                    vocabulary=CONTENT_PARAGRAPHS_VOCABULARY,
                     required=False)
 
     target = Attribute("Anchor target")

--- a/src/pyams_content/component/paragraph/portlet/interfaces.py	Tue Nov 27 15:35:22 2018 +0100
+++ b/src/pyams_content/component/paragraph/portlet/interfaces.py	Tue Nov 27 15:35:58 2018 +0100
@@ -12,17 +12,14 @@
 
 __docformat__ = 'restructuredtext'
 
-
-# import standard library
-
-# import packages
 from zope.schema import Bool, Choice, List, Set
 
-from pyams_content import _
-# import interfaces
+from pyams_content.component.paragraph import CONTENT_PARAGRAPHS_VOCABULARY
 from pyams_content.component.paragraph.interfaces import PARAGRAPH_FACTORIES_VOCABULARY
 from pyams_portal.interfaces import IPortletSettings
 
+from pyams_content import _
+
 
 class IParagraphContainerPortletSettings(IPortletSettings):
     """Paragraphs container portlet settings interface"""
@@ -31,7 +28,7 @@
                       description=_("List of selected paragraphs; an empty selection means that "
                                     "all paragraphs will be selectable by following filters; otherwise, "
                                     "this selection will have priority"),
-                      value_type=Choice(vocabulary='PyAMS content paragraphs'),
+                      value_type=Choice(vocabulary=CONTENT_PARAGRAPHS_VOCABULARY),
                       required=False)
 
     factories = Set(title=_("Paragraph types"),
@@ -53,7 +50,7 @@
                       description=_("List of paragraphs selected for navigation; an empty selection means that "
                                     "all paragraphs will be selectable by following filters; otherwise, "
                                     "this selection will have priority"),
-                      value_type=Choice(vocabulary='PyAMS content paragraphs'),
+                      value_type=Choice(vocabulary=CONTENT_PARAGRAPHS_VOCABULARY),
                       required=False)
 
     factories = Set(title=_("Paragraph types"),