Create semanthic categories

[Masclins]

Description of the current behaviour
Entries are not grouped anyhow. That means that if we want to create some navigation interface through the dictionary, it can only be done alphabetically.

Description of the behaviour you'd like
Creating some way to categorize entries. That will let us create a semanthic dictionary.

Description of considered alternatives
I can think of three ways to do so:

• Manually creating the database of categories.
• Letting users modifies categories somehow (though it would require to do the previous point first).
• Finding some already existent database of categories and using it.