Bug. Category name change when changing category label

[qwerg]

When you change the label of an already made BEdita category, the category name is also modified. However the category name should be stable, as a uniquename.
Maybe we could also manage both fields (name and label) in the backend category management view.

[batopa]

The category name would be editable only by administrators.

[batopa]

I have two doubts:

1. what we should do in this case. A category was created in a specific module with label category test and the name generated was category-test. Then the label is changed in category test it. The name remains category-test.
   In the same module a new category with the same label category test it is created. Since the name generated automatically is category-test-it the entry is ok but then we have two categories with the same label on the same module. What should we do? Avoid label duplication?
2. what about tags? Tags are handled by the same Category model. Changing tag label should change also unique name or it should behave as category?

[batopa]

Talking with @qwerg we decided to proceed in the following way:

1. No check on category labels. The category name will be visible in readonly mode for all users. Only administrators could change it.
2. Tags behaves exactly as category. The tag name will be visible in readonly mode for all users. Only administrators could change it.

[batopa]

Implemented
@qwerg test it then if you could adjust the style in manage categories. The tab where to add new category is now shorter then the rows of the table above due to the addition of the unique name column