How to design a user defined graph structure?

First, my code to review:

class Edge(models.Model):
    '''A link between two pages'''
    u = models.ForeignKey(Page)
    v = models.ForeignKey(Page)

class Page(models.Model):

    en_title = models.CharField(max_length=200)
    es_title = models.CharField(max_length=200)

    en_text = models.CharField(max_length=1000)
    es_text = models.CharField(max_length=1000)

    # Alternative to using the Edge class:
    # next = models.ForeignKey(Page)
    # prev = models.ForeignKey(Page)

Here is an example of how pages might be arranged:

# Using class Edge:
# {2:4, 4:12, 12:82, 12:9, 9:7, 7:8, 8:None, 82:93, 93:None}

2-->4-->12-->9-->7-->8
         \            \
          `-->82-->93->None

# Only using Page class with next/pref attributes (delete Edge class):
# {pages}

None<--2<-->4<-->7<-->9<-->10<-->1<-->90-->None

The Edge class allows for more flexible structure of pathways for consumers to traverse. But a doubly linked list might be easier to use.

In short my 2 questions are:

1. What would I need to code so a user could easily define structure and pages independently? I'll be using topological sort for content consumers.
2. What other options do I have for implementing bilingual models?