Update links to internal pages so that translations link to other translations and not to original language nodes

Supposing /node/X is in English and /es/node/Y is the corresponding node in Spanish.

When we translate a page in English that links to /node/X the translation should link to /es/node/Y.

We'll implement this functionality in our module in the following manner:

• All operations will be done when contents is created/edited or translated. No overhead will exist for rendering.
• Each node will have a 'dirty' flag. This flag will indicate that the node includes links to pages in other languages.
• When we store translations, our module will attempt to adjust all links in a node. If it manages, it will mark it as clean.
• At that time, all other 'dirty' nodes will be checked to see if their links should update. The dirty bit will also update at that time.
• This will also happen when users edit contents (manually edit translations).

The automatic link replacement will be an optional feature of this module.