noosfero | WIP: Fixes/Improves categories admin pages (!1126)

[Gabriel Silva]

New Merge Request !1126

https://gitlab.com/noosfero/noosfero/merge_requests/1126

Project:Branches: gabrielssilva/noosfero:mr_noosfero_1055 to noosfero/noosfero:master
Author:    Gabriel Silva
Assignee:  

Works over !1055, adding the following improvements:

- Refactors categories page to use a generic structure
- Removes `ProductCategory` references from core
- New Style for category lists
- Fixes extra labels on New and Edit pages


New categories page layout:

![new_categories_list](/uploads/ed4ea27c6f6c99fc90d567d279a39a84/new_categories_list.png)

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